Thank you. I had a KA 5002 from 1976-1979 . I used it to D.J. back in the day as well as for my home system with the matching tuner. It still has the best quality knobs of any make or unit ever produced. It was stolen out of my van one night along with two turntables. I replaced it with a new more powerful KR 8010. But the 5002 started my lifelong love for the vintage Kenwood equipment.
Sometimes you just have to wonder if this equipment knows it's being saved for another life and just lets it out. These were fantastic sounding little amps, then and now. Thanks for your time posting this!
Nothing wrong with old Kenwood stuff. I had one in High School and was able to pick up a 60 watt Kenwood receiver for $75 from EBAY that only has one lamp out. Better than the 20 watt model I had back then. Got a nice monster 140 watt Sansui receiver too. Much better than the new home theater receivers made today.
Fantastic video. I believe we are of the same vintage and the 70's for an audio addict were unbelievable. At 18 I bought a Toshiba 40 watt/channel receiver and a set of Klipsch K Horns at the recommendation of an older friend that was an audio engineer at the time. Well in the belief that bigger is better I continued to trade up over the next 5 years from records ( skipped all over the place at higher SPL) to an Akai reel to reel and eventually ending up with a Kenwood KR-8050. I still have the K Horns and the 8050 and they still continue to amaze after 49 years, the neighbors like the sound so much they keep throwing bricks thru my windows so they can hear my system better. My daughter already grabbed an KR-8050, a B&O direct drive turntable and a set of AR-4x speakers for spinning vinyl, just love the sound.
Thanks for watching and sharing. I still have some of my stereo equipment from the 70's, wish I had more of it. It's really that your daughter has some gear.
I had two of those at different times, once in college, sold that, and bought another one to use in my shipboard stateroom as a Naval Officer. Loved it so much, I bought one for my dad to replace his mono tube amp. Great sound, quiet, and I loved the look of it, too. Loved the operation of the knobs and switches. Very satisfying clicks, presses, and turns.
Just finished watching this video again,,, while playing my KA-6000 (MADE IN 1969-70) which is built alot like this Amp And is still kicking and strong, and low noise floor.. Visually its flawless , and inside the unit it looks orig... Not bad for 52 years old... Something special about the sound after its been up and running 30 mins... I also been playing a Sansui 4000 receiver i picked up,,, and has a similar sound,. At least to my ears..
Just discovered your channel. Loved the history and Kenwood commercial! Japanese Americans who went back to Japan for education were known as “Kibei” (key-bay). Those that came back and volunteered for service during WWII were in the intelligence arm and they directly broke the Japanese codes to help the US win in the pacific theater. My high school friend’s mother worked for Kenwood in Gardena, California, where I grew up. At the time, Gardena had one of the highest concentrations of Japanese Americans. I got her employee discount for a nice cassette recorder that I wish I still had. I’m still looking for a vintage Kenwood receiver to complete my home stereo setup, thus landing me here on your channel. Thanks for your wonderful video and instruction!
Kenwood-Trio produced fine electronic gear and also became big in communications equipment both in commercial and Amateur Radio in addition to audio equipment. I owned a Kenwood TS-520S that was as solid as a TANK! I still have a Kenwood turntable that has been a solid performer. I like to use my smart phone to take pictures of the parts on the boards as a reference to go back to double check how things need to be put back in. I’m too ADD to trust my memory 😉😂 Excellent presentation and great teaching video!
Thank you very much for the kind words. Kenwood did make some wonderful gear. One of my first components was a KA-3500 integrated amplifier that I purchased in the middle 70's. I still own it today.
Just Found your channel and it's Excellent! Love the content and the long videos are perfect as I often play these types of videos while I work on my own gear . Found this video while searching because next up on the bench is a Kenwood KA-6000 that I got from an older Gentleman that was about to put it to the curb! Imagine that! It works and is in good condition but is all original and a perfect candidate for restoration. It has a lot of the same boards as the KA-5002. The amplifier board looks identical. Your video has some good hints and will be helpful. Perfect timing. Really enjoy that you Include the company history in your videos . Keep up the good work and Thanks !
Fantastic detailed production. Really well done! Working on this vintage stuff is so rewarding, and the results are worth it. You end up with much higher quality gear than the junk that is being produced today. I;d also argue the sonics are better.
Thank you kindly! I appreciate your kind words. Yes, the vintage gear was made to last. I'm sure someone will be listening to this integrated amplifier on her 100th birthday.
Great video. I don’t plan on rebuilding any of these but you are a great teacher and the camera shots are amazing. After seeing the work involved , I will pay the extra for a refurbished unit.
Very nice, you rescued this treasure……I want to have a maintained vintage amp from you….because you are doing it with knowledge and love about old devices 👍
Excellent all your videos, for those who like vintage hifi. Even if you're a layman in electronics, it's a pleasure to watch them and enjoy their expert knowledge. After watching your Kenwood KA 5002 and 3500 videos, because I have a Kenwood KA 2500, which I love for its sweet, true analogue sound, so I would love to see a video about it you made! Who knows one day??? Thanks
You talk too much you say.Well not at all i love the fact that you make sure that certin parts of the video are understood by everyone.i find this video is perfect for a beginner and in no way boaring for a novist.Thankyou verry much for takeing your time to produce a perfect video for all to learn from and enjoy learning at the same time.Please keep up the great work..
Great, great video, thanks for taking the time to post it. As a beginner in electronics, I found your explanation of the restoration process extremely informative. I got lost in the last part of the video when you did the final adjustments, dc offset, etc.. It would be great if you could maybe do a followup video showing the exact steps and equipment used to adjust it and then bench test with basic equipment readily available on the used market such as an analog oscilloscope and signal generator.
Thank you for the kind words and for the suggestions. If you are just starting out take a look at this video where I show how for under a $100 that you can own a oscilloscope/signal generator. - th-cam.com/video/heAuUJR-bmQ/w-d-xo.html
I really like that whole series of Amps. I have a KA-5700 with the meters. You're right - who needs anything else. People are chasing "names". No reason for it at all. Imagine all these people chasing 800 dollar 10 wpc receivers. Thanks for making this video. Wonder if you could do a video diagnosing an amp with DC on the output.
Your welcome and thank you for watching. I haven't made a video specifically on DC offset but I've covered it along with other issues in this repair guide video - th-cam.com/video/r9WCxefytBI/w-d-xo.html
I probably got my best deals buying vintage gear on local bidding sites, with a strong preference for physical pickup AND always in country (live in Switzerland) to limit shipment risks and costs. My favorite buys: 1) Hitachi SR-903 receiver for $140 that is in mint physical condition and works/sounds great; bought it earlier this year. A couple of incandescent lamps required replacement, but otherwise fully operational. Did some cleaning, some DEOXIT and checked the DC offsets before use (under 15 mV). I downloaded all of the service related documentation (which is both excellent and FREE) and have put together an Excel sheet to map out the planned transistor and electrolytic capacitor replacements; for next year. 2) about 2 weeks ago I found another Hitachi SR-903 that looked dirtier but was advertised in working order. Bought it for $115 on the same local budding site and from another private seller. I cleaned it up and it shines as minty as the first...had lots of dust inside compared to the first unit. Same treatments and checks were performed to full satisfaction. Runs like a champ...but with similar bulb replacement needs (just a couple). The Excel buying sheet (for all of the discreet components at risk) will be used to buy for both. I figure if I can master the first...the second will go like a breeze! We shall see. I intend to keep these babies and pass them to my kids someday. Both units came with a factory flat black painted wooden case. Condition was excellent for both...but it looks boring as hell. I decided to buy some glossy burled walnut vinyl wrap off of AliEx and carefully wrapped both cases (used a heat gun sparingly). I applied ceramic coating to the vinyl for additional protection...the results are stunning. Each case looks like a lacquered cigar box! Love the look...very premium IMHO. Why Hitachi? They are not well known versus Marantz/Pioneer/Sansui...so they do not command a huge price premium in this used market. Hitachi was a key supplier to the major brands...they knew their stuff back then and put out high quality (over spec'd) units in an attempt to build a foothold in the premium market during the receiver wars. The SR-903 produces 75 watts per channel...However, they utilize what Hitachi termed a G-class amp design with peak power up to 160Watts per channel (to avoid any clipping). More than enough power for my needs. These units look fantastic, sound terrific, and are built like tanks. Classic ALU face plate with hefty ALU knobs, levers and buttons. For me, they were an absolute steal at these prices. I have a few other brands on a rack at home, really mint vintage examples from Pioneer (LX626, SX82E c.1965), Yamaha (CR420), Nakamichi (SR-2E with Nelson Pass designed STASIS amp)...the Hitachi's occupy both the family room and the home office. They are that good, IMHO.
I still use an old Kenwood receiver to power my living room speakers. It sounds so good. I use two vintage Zenith speakers and of course the receiver is the amplifier. the Zenith speakers have a 10 inch low end woofer that actually hits some pretty good lo end frequencies down to 40 hz with ease at more volume that I would ever need or use in my home. It's a 4 channel amp with switching so I also have two slightly smaller satellite speakers in my dining room up high on a shelf and they also have more power than I would ever need so I can A/B the rooms or run both rooms left and right or run surround in one room if desired but not needed in my space. It's wonderful just tossing a blue ray or DVD in. Movie theatre quality for sure. You can feel the floor move when there is a steam roller in the movie and it's turned up a bit.
I always Loved Kenwood products, I live in the Northeast and in the Eighties we had a specialty retailer called Tweeter Etc. they only sold high end stereo equipment, Yamaha, Onkyo, clipch, Kenwood And so On, I bought many of my Car stereo systems there, all Kenwood and it Blew the doors off anything I had previously owned. Never had a stereo and Amp package that sounded that good. They were Pricey, but well worth it. I’ve been a Huge fan ever since.
Thanks for sharing! I remember hitting my local stereo dealers back in the 70's. My Pizza Hut salary didn't go far but every now and then I brought something new home.
excellent instruction .. should have watched this video first .. but still learning... tool prices have really increased on that de-solder gun by Hako .. may have to get it anyway .. and found the Kenwood history to be amazing ... that history lesson, and of course their reputation among Ham Radio operators, speaks volumes as to their importance as a major player in electronics .. much respect for presenting this information and for a great instructional video
Thank you for uploading this presentation and your explanation is always excellent. BTW, at 19:13, I see Sony Building scene. I was there in 1975, that is the Sony presentation building located in Ginza, Tokyo. I went inside and Sony was demonstrating their best preamplifier and power amplifier that time, the Sony TAE-8450 preamplifier and TAN-8250 power amplifier hooked up to some kind of strange looking square woofer, I don't believe that was an electrostatic. It sounded very good. Sony made VFET amps, one was TAN-8550, I had that. I bought integrated version from Air Force Exchange when I was stationed at Yokota Air Base, Tokyo. Those were the great days for audio equipments.
Your welcome. First of all thank you for your service. Thanks also for sharing your Sony knowledge and experiences. They made some great audio gear back in the day.
WoW ! Just WoW! This was an awesome tech video , thank you some much for takingthe time to show as well as teach us about vintage auto equipment . Im looking forward to more in the future again thank you very much
I have this amp... Worked flawlessly for 50 years. Then one side quit. So became a subwoofer amp... Maybe I DO need a de-soldering station .. love that amp.
I have a KA-7000. It's a great amp. The direct couple aspect provides great fidelity. While the amp is top notch, the phono amp is good but not up to the level of the amp. Adding an after market phono pre-amp brings this amp alive.
I shared this grwat video with Vintage Kenwood lovers facebook group also. This is a great video. I loved how you explained the history and shared documentation! Well done!
Marvelous ! What a swanky nice legacy KENWOOD Amplifier. I do own the grandson KENWOOD L01-A & L01-T mint condition but in a faulty state where a KENWOOD repair service in Cologne never had been able to fix.
i am a kenwood user since the 70´s but in Europe they ask thousands of €´s for that integrated amplifier, those 30 watts can boost 190 watts speakers and with the tone controls it delivers such a clean high´s and lows ,also the speakers at the time were huge having only 30 to 50 watts at the most but a very clean and perfect sound, the impedance selector for the turntable cartridge it´s a rare thing to see in today´s amp.´s but needed with a lot of changing cartridges fashion today
@@vintageaudioaddict thank you for the great videos, when studying i changed from electronics to a Informatic degree , it was new at the time , today i can´t restore old hi-fi equipment as you do , have always to meet with an old friend who continued his studies in electronics and high-voltage systems, regards
Well, hello there Vintage Audio Addict. Thank You so much for your Channel and all that you put into it. You have a wonderful way with your guidance. Easily understood, (by me), Concise and thorough. That makes sharing in your Channel a complete joy for me. By the time that you were wrapping things up here, I was more knowledgeable AND more Relaxed than when I began. This is a pretty great combination so, I Thank You again. Now I know where to come for my "Schooling." I would like to ask a question, of you, before I go... I need to apologize, in advance, for my ignorance regarding a possible "Work Around" for my issue. Through a weird set of circumstances, I now find myself with multiple sets of Speakers that are all rated at 4 ohms, yet the only Receivers / Amplifiers that I have, are all rated at 8 ohms. I've had money most of my life, but no more, so I don't have a lot of choice, but to do my best with what I have. Do I understand correctly that if I were to take 2 sets of 2 speakers and wired them together in "Serial," as opposed to in "Parallel," that my Receiver would then see the Impedance as 8 ohms per channel, instead of their native 4 ohms per channel? I'm not certain that I fully comprehend the intricacies of matching ohms. For years I had been using a Denon AV/Surround Receiver, without issue... until one day, seemingly out of nowhere, my Receiver shut itself down and never to return. Not even after using the Key-Press Combination to Reset it. It behaves as though it is going through the process of Resetting itself, but never comes back to life?! So, because I have no money to spend, I am concerned that I might "Kill" whatever replacement Receiver I might choose to use. I only have 3 to select from, and as I said all of my choices, in receivers are of the 8 ohm variety. Thank you for your patience. Anything that you can do to help me will be greatly appreciated. Living Life without Music, is a bit like Living Life in Black & White, for me and I need some happiness here. (lol) I hope that you remain Well & reasonably Happy too. Keep Smiling... Cheers... 😇
First of all thank you for your kind words and for watching. There is no one answer to your situation. When it comes to running multiple speakers from your equipment you have to be careful. Most speakers are not a uniform 4 or 8 ohms through the audio spectrum. At certain frequencies their impedance can be much lower or higher then rated. Some can be difficult loads for audio equipment. Receivers/amps with 4 or 8 ohm ratings are the same. There is no one specification that fits all. Some tolerate certain speakers better then others because of their current handling abilities. You have to be especially careful when you attempt to wire more then one pair of speakers to a receiver/amplifier.
@@vintageaudioaddict Wow, that was a quick response! I really didn't expect that so, Thank You. I was afraid that the answer to my question might be an elusive one. UGH! does it make any real difference as to the grade of Speakers in use? If so: I have 3 pairs. All of them are "Polk Audio. One set is "Floor Standing" and cost me about $1,000.00 each. The next pair is a "Mid-Sized" and about 22" tall and were about $600.00 each. The third pair are "Bookshelf" Speakers & I traded some equipment for them... and YES, they are all rated at 4 ohms. So, at least they're not of the Super Cheap variety. When the Floor Standing Speakers were purchased, the upper scale Stereo Addiction Dealer sold them to me with a Denon AV Surround Receiver. (Rated at 80 watts per X 5.1), but had a Stereo mode too. Well this combination lasted me for more than 10 years... until it didn't any longer. The only reason that I brought up anything other than the Large, Floor Standing Speakers, was because I had hoped that I could fool my receiver into seeing 8 ohms impedance attached to the 2 Stereo Front Speakers. Otherwise I don't expect to run anything but the large ones, unless... Oh man, I'm so sorry, I didn't intend to write you a book here. So, it looks like I don't currently have anything like a good solution to my problem then? Ha! Yet another case of "Acceptance" I suppose. ARGH! Thank you for sharing your knowledge and expertise with me. You are appreciated for this. Remain Well & Take Care, Cheers.
Love your videos! You must’ve been a video guy in previous life as your videos are beautifully shot n graphics are top notch. Digging all the history of these companies. Well done you!
At 49:55, That's the route I would take, unless I want to go all out and purchase CAPs that are costume made. Yes there available!! Those bars, are called: binding posts!!
I do repair and restoration equipment as well, I have a KA-7002 I need to get to. I’m sure this has already been said in the comments, but another benefit of going to film caps for the smaller electrolytic values is that in theory they should be permanent. They won’t need changed out in the future like the electrolytics would.
The main difference with electrolytic capacitors is longevity and if the start leaking over time. The big catch for new players is counterfeit capacitors, which are all over particular auction sites. The main thing is to buy your components from a reputable source and not from some cheap seller on one of those auction sites. I would always do like for like replacements. If the original has electrolytics, replace with electrolytics. The rest of the circuitry is designed to work with the nuances of those capacitors. Nice to see this up and running again. This old stuff is worth restoring. A lot of new equipment using name branding is not made by the original company anymore.
That quirky historical stuff is fun to learn about. Radio Shack marketed CBs under Archer and Lafayette. AFAIK those were Trio products. Not sure about the Lafayette stereo equipment, which rapidly faded into obscurity. Was Realistic (Radio Shack) also Trio? The tuner doodads on Realistic receivers were heavily promoted, and Trio was really into doodads.
I would just like to say I am enjoying your videos. I am looking to start a new hobby of fixing vintage equipment and this has given me the confidence to do so. Hopefully with the sudden increase in demand in vintage equipment, I can find some for a reasonable price and fix them up. A few things I did notice: - For applying thermal compound, could you use a nylon brush for applying the compound? I use them at work for applying lithium grease to moving mechanical components. -I was wondering why you decided to keep the old filter capacitors in the chassis after installing the new capacitors. -You have a couple of audio files overlaying each other, particularly around 44:56 while you are explaining something. Would you show a video where you would use an oscilloscope for diagnosing faulty components? I would like to see some troubleshooting techniques with that particular piece of equipment. This was a great in-depth, yet simple explanation of vintage audio repair with a nice list of helpful tools. I look forward to more videos. Cheers
Great narration, explaining each step in detail, always necessary for amateur restorers of vintage equipment. And, I fully agree, many of the vintage amplifiers out there can be as good - if not better - than most of the overpriced 'modern' offerings. The additional benefit of vintage equipment is the relative ease of servicing them, as against the minute micro-components (resistors, caps etc), used on most printed boards now that require a microscope to observe and are a real 'pain' to replace. So, thank You for a most informative and entertaining video. One hour and eighteen minutes well spent! 🙂🙂
I had a Kenwood Tuner (KT-7000) and Scope (KT-6060a) from that era. I traded-in the Tuner in 1999. Recently re-capped the scope and use it as a diode tester. I always thought that was a cool looking amp. SONY and Kenwood had the best front panel designs in the 70's. (IMHO)
Great video, as always it's full of excellent advice and so detailed. I absolutely enjoyed every minute of it. I hope to find a gem just like this to have a go myself.
Wow. Can't believe this .I have this unit along with the tuner. The 5002 Rt channel has stared to get very low. The balance doesn't help and is way off. Started looking today for help and no one knows anywhere to repair it. I'm at my wits end. Had this since 1971 and it's been great. Started looking TODAY for help and saw this. I cleaned what I could with Deoxit. Didn't help. Any advice would be greatly appreciated. Thank you.
Thank you for the great Kenwood amplifier restoration, Great job! Reguardind the WILM metal caps you used. Would you mind sharing what series of caps you use? Thank you again. Your videos are awesome.
Nicely done. did I miss where you checked the +/- highest voltages for the power amplifier and all the low voltage values that are distributed to the various modules? And with a quick look, perhaps I must have missed the check on the DC balance of the speaker connections before you connected speakers. Many times the fingers on modules are not gold plated and need to be cleaned. On occasion, I've taken apart alternate action push switches because of intermittents.
Thanks for watching. I'm really not sure what I showed in this particular video. I just don't remember. I usually go through them pretty thoroughly but I don't always show everything in every video. Thanks again for watching.
Hi, the second video of yours I've watched and I think there really thorough, even including some company history of products being restored. I notice with a lot of videos like this that resistors are rarely ever mentioned. Ben Duncan in the eighties, writing for HiFi News & Record Review wrote an article on building your own quite sophisticated preamplifier. It was a really thorough article ( a good read) and one of the things he included was frequency response curves relative to the component parts tolerances. It showed quite clearly how very tight, even better than a percent affects the response. I know that this is a budget project but maybe one place to improve resistors is the phono section, particularly the load resistors to at least a one percent metal film type; still very affordable and should give an audible improvement. In one update to a high-end preamp that used 1.0% metal film throughout the design, I installed matched Vishay to 0.01% film and foil resistors ( I think $25.00-$30.00 a pair. I know, insane) in critical places like the phono section, it capable of up to 80 dB of gain to noticeable effect. anyhow, great stuff. Makes me want to pick up some projects to repair. I even picked up A Hakko Fr-301 on Amazon. But they're not $100.00 anymore.
Thanks for watching. Thank you also for sharing your experiences. The information helps everyone to make better decisions when repairing, restoring or updating their equipment. Your going to love that de-soldering tool!
If it sounds good to you, it's worth it. But I can't imagine anywhere in an amplifier circuit that a 0.01% resistor would make a difference. Transistor gain is going to vary lots more than that. You could always put in trimming pots in series or parallel and "tune for minimum smoke", as the hams say.
When I google "troublesome transistors" the first link is the list. Maybe throw in "vintage audio" with the search? I didn't have to but when I did the same list came up.
nice! That one looks really nice, love that silver face. I just got a Kenwood dual cassette deck model KX W892 in perfect working order and really great aesthetic condition for 12 dollars. Sounds pretty alright.
I have this same Kenny but the 7002 spec. Absolute sleeper of an amp. Amazing built like tank and solid internals albeit requiring recapping and transistor replacement as needed. Using this as my main pre-ampnalomgside a Kenwood KA 6004. Open , dynamic, deep fine bass tube like sound with solid state reliability that can rival or even put modern amps into shame. Only downside is that finicky and tricky Null balance set up.
Kenwood had some great integrated amps.... I prefer the one's from 1969-1974.... I just picked up a minty KA-6000, which i think was one of Kenwood first S.S. integrated ... Inside the unit its very busy and made me think of a tube amp.... It plays nice,,, but wish i had the know how on and where to begin and replace old parts.
Nice Find! Just do a little internet research. There's a lot of info out there on most any piece of vintage audio equipment. Maybe that will help you figure out on how to proceed with your new unit. Good Luck!
Yes, I thought the same about this amp.... but instead of "busy" the word was messy. It looks like the model they made just prior to this was a valve amp, aside of being riddled with those crap wirewraps. I guess the performance level of this is like what my Dr says when we go over my perfect Cholesterol levels... "How does he do it"?
Guess what, a KA-4000 will cost you $450 NZ in New Zealand, it is very rare find aything worth anything that is a genuine bargain. I can only look on with awe as you buy and restore some gems into something some one can value again. I look forward to more reveals of equipment you have acquired, but can only watch as I know I can not do it here, well not on my pay grade. Love your content, always an education, and a dry sense of humour always goes a long way...
Kevin, greeting from the USA. Thank you so much for your kind words. A few years ago here in the states this type of equipment was being put out to the curb. Now for the most part bargains are hard to find here also.
This is the model just below the KA-7002, which was Kenwood's first DC-coupled integrated amp. I owned a KM-8002, which is the power amp version of the KA-7002, for many years and it was a very good performer -- but I must say, as good as it was, I now have a couple of sub-$100 (including outboard PSU) Chinese "chip amps" that easily outperform both that KM-8002 and the "audiophile" Adcom GFA-535 that replaced it in my system back in the day. Audio has never been better in terms of price/performance ratio than it is today. Collecting vintage gear is a fun hobby -- and, for we old-timers, a nostalgic trip down memory lane -- but the best way to not "spend a fortune to get the great sound" is to buy carefully selected modern gear. Don't get me wrong, I still have a couple of mid-'80s Yamaha pieces in my system and much appreciate the thorough engineering and meticulous Japanese craftsmanship that went into them -- but if there were modern equivalents for sensible prices I'd happily retire them.
Thank you for sharing. I get what your saying. For me, vintage electronics is a lot like classis cars and modern cars. A lot of good can be said about both.
@@vintageaudioaddict -- Your videos are very nostalgic for because of the years I spent managing a busy audio repair shop back in the '70s. As a factory authorized "service center," we worked on thousands of Kenwood, Sansui, and Pioneer products -- not to mention dozens of other brands -- and it's interesting to see how nicely this particular piece held up after all these years, those problematic little transistors notwithstanding. Thank you for your work!
Thanks for watching! That list is on my network so I don't have a link to it. If you google "Troublesome transistors in vintage audio" something like it should pop up for you.
Great video. I have an old Sansui 661 that I bought in 1973. The FM tuner dial shows the stations about 10 numbers low, like 107, coming in at 104 on the dial. What would be the cause.Everything else seems to work fine.
Thanks. With your tuner if could something as easy as the tuning string has started to slip some. Bee's wax works well on the tuner string if that's the case. Of coarse it could be more then that but that's something you may be able to look at.
@@vintageaudioaddict Thank you for the reply. Yes, I think it's something more, because down at the lower end of the dial the distance of the discrepancy is less.
What a great presentation of restoring a beautiful amp !!! Deserves my total respect & admiration !
Thank you. I had a KA 5002 from 1976-1979 . I used it to D.J. back in the day as well as for my home system with the matching tuner.
It still has the best quality knobs of any make or unit ever produced. It was stolen out of my van one night along with two turntables.
I replaced it with a new more powerful KR 8010. But the 5002 started my lifelong love for the vintage Kenwood equipment.
Sometimes you just have to wonder if this equipment knows it's being saved for another life and just lets it out. These were fantastic sounding little amps, then and now. Thanks for your time posting this!
Your welcome and well said!
Nothing wrong with old Kenwood stuff. I had one in High School and was able to pick up a 60 watt Kenwood receiver for $75 from EBAY that only has one lamp out. Better than the 20 watt model I had back then. Got a nice monster 140 watt Sansui receiver too. Much better than the new home theater receivers made today.
Couldn't agree more. Thanks for commenting.
Typical Japanese mass-fi from the 70's. Nothing special aurally; just lots of bells and whistles..and meaningless specs.
owned the KA-6000 for many years . . bought it when it first came out. . . fantastic integrated amp!
Yes, it is. Kenwood made a lot of great gear back in the day.
Fantastic video. I believe we are of the same vintage and the 70's for an audio addict were unbelievable. At 18 I bought a Toshiba 40 watt/channel receiver and a set of Klipsch K Horns at the recommendation of an older friend that was an audio engineer at the time. Well in the belief that bigger is better I continued to trade up over the next 5 years from records ( skipped all over the place at higher SPL) to an Akai reel to reel and eventually ending up with a Kenwood KR-8050. I still have the K Horns and the 8050 and they still continue to amaze after 49 years, the neighbors like the sound so much they keep throwing bricks thru my windows so they can hear my system better. My daughter already grabbed an KR-8050, a B&O direct drive turntable and a set of AR-4x speakers for spinning vinyl, just love the sound.
Thanks for watching and sharing. I still have some of my stereo equipment from the 70's, wish I had more of it. It's really that your daughter has some gear.
I had two of those at different times, once in college, sold that, and bought another one to use in my shipboard stateroom as a Naval Officer. Loved it so much, I bought one for my dad to replace his mono tube amp. Great sound, quiet, and I loved the look of it, too. Loved the operation of the knobs and switches. Very satisfying clicks, presses, and turns.
These era of Kenwood equipment show their lineage to transition early Accuphase- I own love and enjoy the KA 7002
Just finished watching this video again,,, while playing my KA-6000 (MADE IN 1969-70) which is built alot like this Amp
And is still kicking and strong, and low noise floor.. Visually its flawless , and inside the unit it looks orig... Not bad for 52 years old... Something special about the sound after its been up and running 30 mins... I also been playing a Sansui 4000 receiver i picked up,,, and has a similar sound,. At least to my ears..
Sweet! I had the KA-7002 which I bought in 1972. It was a great amp. I lost track of it after going in the Army, but I had many fond memories of it.
Thank you for sharing and for your service.
I still have one that needs some work. You can buy mine off me for a measly 100 million dollars!
Just discovered your channel. Loved the history and Kenwood commercial! Japanese Americans who went back to Japan for education were known as “Kibei” (key-bay). Those that came back and volunteered for service during WWII were in the intelligence arm and they directly broke the Japanese codes to help the US win in the pacific theater.
My high school friend’s mother worked for Kenwood in Gardena, California, where I grew up. At the time, Gardena had one of the highest concentrations of Japanese Americans. I got her employee discount for a nice cassette recorder that I wish I still had. I’m still looking for a vintage Kenwood receiver to complete my home stereo setup, thus landing me here on your channel. Thanks for your wonderful video and instruction!
Your welcome! Thank you for the information and for sharing your story. I really enjoy the history behind this equipment.
Kenwood-Trio produced fine electronic gear and also became big in communications equipment both in commercial and Amateur Radio in addition to audio equipment. I owned a Kenwood TS-520S that was as solid as a TANK! I still have a Kenwood turntable that has been a solid performer.
I like to use my smart phone to take pictures of the parts on the boards as a reference to go back to double check how things need to be put back in. I’m too ADD to trust my memory 😉😂
Excellent presentation and great teaching video!
Thank you very much for the kind words. Kenwood did make some wonderful gear. One of my first components was a KA-3500 integrated amplifier that I purchased in the middle 70's. I still own it today.
@@vintageaudioaddict unfortunately too many of the contemporary consumer electronic devices will be in a landfill within 10 years.
Just Found your channel and it's Excellent! Love the content and the long videos are perfect as I often play these types of videos while I work on my own gear . Found this video while searching because next up on the bench is a Kenwood KA-6000 that I got from an older Gentleman that was about to put it to the curb! Imagine that! It works and is in good condition but is all original and a perfect candidate for restoration. It has a lot of the same boards as the KA-5002. The amplifier board looks identical. Your video has some good hints and will be helpful. Perfect timing. Really enjoy that you Include the company history in your videos . Keep up the good work and Thanks !
Your welcome. Thank you so much for your kind words.
Fantastic detailed production. Really well done!
Working on this vintage stuff is so rewarding, and the results are worth it. You end up with much higher quality gear than the junk that is being produced today. I;d also argue the sonics are better.
Thank you kindly! I appreciate your kind words. Yes, the vintage gear was made to last. I'm sure someone will be listening to this integrated amplifier on her 100th birthday.
I have a Kenwood KA-4002A. I changed the electrolitics and some demaged transistors. It is working well and beatifully.
Good job of keeping her running!
Whenever you present another vintage Kenwood, my heart lightens up. Awesome!
Thank you. Kenwood made some great audio gear back in the day.
Great video. I don’t plan on rebuilding any of these but you are a great teacher and the camera shots are amazing. After seeing the work involved , I will pay the extra for a refurbished unit.
Very nice, you rescued this treasure……I want to have a maintained vintage amp from you….because you are doing it with knowledge and love about old devices 👍
Thank you so much for your kind words.
Excellent all your videos, for those who like vintage hifi. Even if you're a layman in electronics, it's a pleasure to watch them and enjoy their expert knowledge.
After watching your Kenwood KA 5002 and 3500 videos, because I have a Kenwood KA 2500, which I love for its sweet, true analogue sound, so I would love to see a video about it you made! Who knows one day???
Thanks
You talk too much you say.Well not at all i love the fact that you make sure that certin parts of the video are understood by everyone.i find this video is perfect for a beginner and in no way boaring for a novist.Thankyou verry much for takeing your time to produce a perfect video for all to learn from and enjoy learning at the same time.Please keep up the great work..
Not the first time I've heard that. Matter of fact first thing this morning having my coffee, lol. Thanks for watching!
Absolutely brilliant work here. How to + fascinating documentary. I loved it!
Many thanks! I appreciate it.
The Hakko FR300 (or equivalent) vacuum desoldering tool is a must/indispensable! .. worth every penny …
Yes, Sir!
Great, great video, thanks for taking the time to post it. As a beginner in electronics, I found your explanation of the restoration process extremely informative. I got lost in the last part of the video when you did the final adjustments, dc offset, etc.. It would be great if you could maybe do a followup video showing the exact steps and equipment used to adjust it and then bench test with basic equipment readily available on the used market such as an analog oscilloscope and signal generator.
Thank you for the kind words and for the suggestions. If you are just starting out take a look at this video where I show how for under a $100 that you can own a oscilloscope/signal generator. - th-cam.com/video/heAuUJR-bmQ/w-d-xo.html
The KT-5000 is the Matching AM-FM Tuner for this Amplifier! Amazing find at the Thrift Store!!
Nice history on the Company!
Thanks for the info and for watching!
I really like that whole series of Amps. I have a KA-5700 with the meters. You're right - who needs anything else. People are chasing "names". No reason for it at all. Imagine all these people chasing 800 dollar 10 wpc receivers. Thanks for making this video. Wonder if you could do a video diagnosing an amp with DC on the output.
Your welcome and thank you for watching. I haven't made a video specifically on DC offset but I've covered it along with other issues in this repair guide video - th-cam.com/video/r9WCxefytBI/w-d-xo.html
I probably got my best deals buying vintage gear on local bidding sites, with a strong preference for physical pickup AND always in country (live in Switzerland) to limit shipment risks and costs.
My favorite buys:
1) Hitachi SR-903 receiver for $140 that is in mint physical condition and works/sounds great; bought it earlier this year. A couple of incandescent lamps required replacement, but otherwise fully operational. Did some cleaning, some DEOXIT and checked the DC offsets before use (under 15 mV). I downloaded all of the service related documentation (which is both excellent and FREE) and have put together an Excel sheet to map out the planned transistor and electrolytic capacitor replacements; for next year.
2) about 2 weeks ago I found another Hitachi SR-903 that looked dirtier but was advertised in working order. Bought it for $115 on the same local budding site and from another private seller. I cleaned it up and it shines as minty as the first...had lots of dust inside compared to the first unit. Same treatments and checks were performed to full satisfaction. Runs like a champ...but with similar bulb replacement needs (just a couple).
The Excel buying sheet (for all of the discreet components at risk) will be used to buy for both. I figure if I can master the first...the second will go like a breeze! We shall see. I intend to keep these babies and pass them to my kids someday.
Both units came with a factory flat black painted wooden case. Condition was excellent for both...but it looks boring as hell. I decided to buy some glossy burled walnut vinyl wrap off of AliEx and carefully wrapped both cases (used a heat gun sparingly). I applied ceramic coating to the vinyl for additional protection...the results are stunning. Each case looks like a lacquered cigar box! Love the look...very premium IMHO.
Why Hitachi? They are not well known versus Marantz/Pioneer/Sansui...so they do not command a huge price premium in this used market. Hitachi was a key supplier to the major brands...they knew their stuff back then and put out high quality (over spec'd) units in an attempt to build a foothold in the premium market during the receiver wars. The SR-903 produces 75 watts per channel...However, they utilize what Hitachi termed a G-class amp design with peak power up to 160Watts per channel (to avoid any clipping). More than enough power for my needs.
These units look fantastic, sound terrific, and are built like tanks. Classic ALU face plate with hefty ALU knobs, levers and buttons. For me, they were an absolute steal at these prices. I have a few other brands on a rack at home, really mint vintage examples from Pioneer (LX626, SX82E c.1965), Yamaha (CR420), Nakamichi (SR-2E with Nelson Pass designed STASIS amp)...the Hitachi's occupy both the family room and the home office. They are that good, IMHO.
Love my Kenwood 600(supreme)! Thank you again for the information and dedication!
The 600 is a fine amp. Your welcome and thank you for watching!
I still use an old Kenwood receiver to power my living room speakers. It sounds so good. I use two vintage Zenith speakers and of course the receiver is the amplifier. the Zenith speakers have a 10 inch low end woofer that actually hits some pretty good lo end frequencies down to 40 hz with ease at more volume that I would ever need or use in my home. It's a 4 channel amp with switching so I also have two slightly smaller satellite speakers in my dining room up high on a shelf and they also have more power than I would ever need so I can A/B the rooms or run both rooms left and right or run surround in one room if desired but not needed in my space. It's wonderful just tossing a blue ray or DVD in. Movie theatre quality for sure. You can feel the floor move when there is a steam roller in the movie and it's turned up a bit.
Thanks for sharing. The vintage audio gear can still hold it's own against the modern audio equipment.
I always Loved Kenwood products, I live in the Northeast and in the Eighties we had a specialty retailer called Tweeter Etc. they only sold high end stereo equipment, Yamaha, Onkyo, clipch, Kenwood And so On, I bought many of my Car stereo systems there, all Kenwood and it Blew the doors off anything I had previously owned. Never had a stereo and Amp package that sounded that good. They were Pricey, but well worth it. I’ve been a Huge fan ever since.
Thanks for sharing! I remember hitting my local stereo dealers back in the 70's. My Pizza Hut salary didn't go far but every now and then I brought something new home.
excellent instruction .. should have watched this video first .. but still learning... tool prices have really increased on that de-solder gun by Hako .. may have to get it anyway .. and found the Kenwood history to be amazing ... that history lesson, and of course their reputation among Ham Radio operators, speaks volumes as to their importance as a major player in electronics .. much respect for presenting this information and for a great instructional video
I have the same amp and out of all of the vintage amps I own it sounds rhe best. Great amp. I was very suprised on how loud and clear this amp was.
Thank you for uploading this presentation and your explanation is always excellent. BTW, at 19:13, I see Sony Building scene. I was there in 1975, that is the Sony presentation building located in Ginza, Tokyo. I went inside and Sony was demonstrating their best preamplifier and power amplifier that time, the Sony TAE-8450 preamplifier and TAN-8250 power amplifier hooked up to some kind of strange looking square woofer, I don't believe that was an electrostatic. It sounded very good. Sony made VFET amps, one was TAN-8550, I had that. I bought integrated version from Air Force Exchange when I was stationed at Yokota Air Base, Tokyo. Those were the great days for audio equipments.
Your welcome. First of all thank you for your service. Thanks also for sharing your Sony knowledge and experiences. They made some great audio gear back in the day.
WoW ! Just WoW! This was an awesome tech video , thank you some much for takingthe time to show as well as teach us about vintage auto equipment . Im looking forward to more in the future again thank you very much
You're very welcome! Thank you so much for your kind words.
I have this amp... Worked flawlessly for 50 years. Then one side quit. So became a subwoofer amp... Maybe I DO need a de-soldering station .. love that amp.
50 Years of service. That's pretty darn good.
I have a KA-7000. It's a great amp. The direct couple aspect provides great fidelity. While the amp is top notch, the phono amp is good but not up to the level of the amp. Adding an after market phono pre-amp brings this amp alive.
Thanks for sharing. Kenwood made a lot of great audio gear back in the day.
I'm glad I still own a Basic C2 and Basic M2. Bought it when it came out in the 80s because it was above average and I think still is today.
You have some outstanding gear!
@@vintageaudioaddict Thank you and thanks to Kenwood. I remember the audio magazines of that days... 😂
Another excellent video really enjoy the long form presentation.
Thank you very much!
Excellent video, I notice your vintage Marantz TT, I’m still using my 6300 I bought in ‘76’… with a SX 737 I got at the same time.
Thank You….
Your welcome. Thank you for watching. It's great that you still have your Marantz turntable along with your Pioneer after all of these years.
I shared this grwat video with Vintage Kenwood lovers facebook group also. This is a great video. I loved how you explained the history and shared documentation! Well done!
Awesome! Thank you!
Marvelous ! What a swanky nice legacy KENWOOD Amplifier. I do own the grandson KENWOOD L01-A & L01-T mint condition but in a faulty state where a KENWOOD repair service in Cologne never had been able to fix.
Thank you. Man, you have some awesome equipment! Hopefully you can find someone to help you get your gear back into service.
Sansui AU 717. Garrard 401 turntable. 4 leak sandwich 600 speakers. Job done
i am a kenwood user since the 70´s but in Europe they ask thousands of €´s for that integrated amplifier, those 30 watts can boost 190 watts speakers and with the tone controls it delivers such a clean high´s and lows ,also the speakers at the time were huge having only 30 to 50 watts at the most but a very clean and perfect sound, the impedance selector for the turntable cartridge it´s a rare thing to see in today´s amp.´s but needed with a lot of changing cartridges fashion today
Thank you for sharing.
@@vintageaudioaddict thank you for the great videos, when studying i changed from electronics to a Informatic degree , it was new at the time , today i can´t restore old hi-fi equipment as you do , have always to meet with an old friend who continued his studies in electronics and high-voltage systems, regards
Well, hello there Vintage Audio Addict. Thank You so much for your Channel and all that you put into it. You have a wonderful way with your guidance. Easily understood, (by me), Concise and thorough. That makes sharing in your Channel a complete joy for me. By the time that you were wrapping things up here, I was more knowledgeable AND more Relaxed than when I began. This is a pretty great combination so, I Thank You again. Now I know where to come for my "Schooling."
I would like to ask a question, of you, before I go... I need to apologize, in advance, for my ignorance regarding a possible "Work Around" for my issue. Through a weird set of circumstances, I now find myself with multiple sets of Speakers that are all rated at 4 ohms, yet the only Receivers / Amplifiers that I have, are all rated at 8 ohms. I've had money most of my life, but no more, so I don't have a lot of choice, but to do my best with what I have.
Do I understand correctly that if I were to take 2 sets of 2 speakers and wired them together in "Serial," as opposed to in "Parallel," that my Receiver would then see the Impedance as 8 ohms per channel, instead of their native 4 ohms per channel? I'm not certain that I fully comprehend the intricacies of matching ohms. For years I had been using a Denon AV/Surround Receiver, without issue... until one day, seemingly out of nowhere, my Receiver shut itself down and never to return. Not even after using the Key-Press Combination to Reset it. It behaves as though it is going through the process of Resetting itself, but never comes back to life?! So, because I have no money to spend, I am concerned that I might "Kill" whatever replacement Receiver I might choose to use. I only have 3 to select from, and as I said all of my choices, in receivers are of the 8 ohm variety.
Thank you for your patience. Anything that you can do to help me will be greatly appreciated. Living Life without Music, is a bit like Living Life in Black & White, for me and I need some happiness here. (lol) I hope that you remain Well & reasonably Happy too. Keep Smiling... Cheers... 😇
First of all thank you for your kind words and for watching. There is no one answer to your situation. When it comes to running multiple speakers from your equipment you have to be careful. Most speakers are not a uniform 4 or 8 ohms through the audio spectrum. At certain frequencies their impedance can be much lower or higher then rated. Some can be difficult loads for audio equipment. Receivers/amps with 4 or 8 ohm ratings are the same. There is no one specification that fits all. Some tolerate certain speakers better then others because of their current handling abilities. You have to be especially careful when you attempt to wire more then one pair of speakers to a receiver/amplifier.
@@vintageaudioaddict Wow, that was a quick response! I really didn't expect that so, Thank You.
I was afraid that the answer to my question might be an elusive one. UGH! does it make any real difference as to the grade of Speakers in use? If so: I have 3 pairs. All of them are "Polk Audio. One set is "Floor Standing" and cost me about $1,000.00 each. The next pair is a "Mid-Sized" and about 22" tall and were about $600.00 each. The third pair are "Bookshelf" Speakers & I traded some equipment for them... and YES, they are all rated at 4 ohms. So, at least they're not of the Super Cheap variety. When the Floor Standing Speakers were purchased, the upper scale Stereo Addiction Dealer sold them to me with a Denon AV Surround Receiver. (Rated at 80 watts per X 5.1), but had a Stereo mode too. Well this combination lasted me for more than 10 years... until it didn't any longer.
The only reason that I brought up anything other than the Large, Floor Standing Speakers, was because I had hoped that I could fool my receiver into seeing 8 ohms impedance attached to the 2 Stereo Front Speakers. Otherwise I don't expect to run anything but the large ones, unless...
Oh man, I'm so sorry, I didn't intend to write you a book here.
So, it looks like I don't currently have anything like a good solution to my problem then? Ha! Yet another case of "Acceptance" I suppose. ARGH!
Thank you for sharing your knowledge and expertise with me. You are appreciated for this. Remain Well & Take Care, Cheers.
Love your videos! You must’ve been a video guy in previous life as your videos are beautifully shot n graphics are top notch. Digging all the history of these companies. Well done you!
Thank you so much! The video side of this has turned into a hobby by itself, keeps an old man learning new stuff.
Best videos on TH-cam. Please continue and do more.
Thank you so much!
nice a smoke stopper for ac equipment, i first learned of these when building drones and testing them to not blow any components
At 49:55, That's the route I would take, unless I want to go all out and purchase CAPs that are costume made. Yes there available!!
Those bars, are called: binding posts!!
Thank you for the information.
I do repair and restoration equipment as well, I have a KA-7002 I need to get to. I’m sure this has already been said in the comments, but another benefit of going to film caps for the smaller electrolytic values is that in theory they should be permanent. They won’t need changed out in the future like the electrolytics would.
That's true. Thanks a lot for sharing.
The main difference with electrolytic capacitors is longevity and if the start leaking over time. The big catch for new players is counterfeit capacitors, which are all over particular auction sites. The main thing is to buy your components from a reputable source and not from some cheap seller on one of those auction sites. I would always do like for like replacements. If the original has electrolytics, replace with electrolytics. The rest of the circuitry is designed to work with the nuances of those capacitors.
Nice to see this up and running again. This old stuff is worth restoring. A lot of new equipment using name branding is not made by the original company anymore.
👍🏻😎 Excellent video! I will definitely be saving this one for future reference. Thanks!
Glad it was helpful! Thank you for watching!
the KA-7002 & KT-7001 are a fantastic combo's. i also had the oscilloscope that matched these
Yes, they are. Kenwood made really good audio gear back in the day.
Outstanding!. Subscribed and liked
Thank you very much!
That quirky historical stuff is fun to learn about. Radio Shack marketed CBs under Archer and Lafayette. AFAIK those were Trio products. Not sure about the Lafayette stereo equipment, which rapidly faded into obscurity. Was Realistic (Radio Shack) also Trio? The tuner doodads on Realistic receivers were heavily promoted, and Trio was really into doodads.
When soldering you need the proper solder thickness for the project. And an adequate wattage soldering iron. So you don’t overheat the solder pads.
I would just like to say I am enjoying your videos. I am looking to start a new hobby of fixing vintage equipment and this has given me the confidence to do so. Hopefully with the sudden increase in demand in vintage equipment, I can find some for a reasonable price and fix them up.
A few things I did notice:
- For applying thermal compound, could you use a nylon brush for applying the compound? I use them at work for applying lithium grease to moving mechanical components.
-I was wondering why you decided to keep the old filter capacitors in the chassis after installing the new capacitors.
-You have a couple of audio files overlaying each other, particularly around 44:56 while you are explaining something.
Would you show a video where you would use an oscilloscope for diagnosing faulty components? I would like to see some troubleshooting techniques with that particular piece of equipment.
This was a great in-depth, yet simple explanation of vintage audio repair with a nice list of helpful tools. I look forward to more videos.
Cheers
Great narration, explaining each step in detail, always necessary for amateur restorers of vintage equipment.
And, I fully agree, many of the vintage amplifiers out there can be as good - if not better - than most of the overpriced 'modern' offerings.
The additional benefit of vintage equipment is the relative ease of servicing them, as against the minute micro-components (resistors, caps etc), used on most printed boards now that require a microscope to observe and are a real 'pain' to replace.
So, thank You for a most informative and entertaining video. One hour and eighteen minutes well spent! 🙂🙂
Your very welcome and thank you for the kind words. Very good point about the serviceability of the vintage equipment compared to the modern gear.
I really enjoyed this restoration. Thanks for sharing it with us.
My pleasure! Thank you for watching!
I figured you would have had more Yamaha and the Pioneer rack mount setup ! Nikko Audio ! Nonetheless, an awesome collection !
Thanks!
Excellent work, beautiful amplifier
Thank you! Cheers!
Catching up on a few older ones.. nice amp and nice job. Hope you will still be doing some vids :- )
I too repaired my Sansui au-666. I changed some caps and replaced most transistors and works again perfectly.
Good Job! Your Sansui is a fine piece of equipment.
Thank you for the history and restoration.
I had a Kenwood Tuner (KT-7000) and Scope (KT-6060a) from that era. I traded-in the Tuner in 1999. Recently re-capped the scope and use it as a diode tester. I always thought that was a cool looking amp. SONY and Kenwood had the best front panel designs in the 70's. (IMHO)
Love the channel Buss !!! 😎👍👍
Glad you enjoy it! Thanks for watching.
I rinse those small boards down with DEOXIT and sometime clean preserve with CORROSION X or ACF 50 for corrosion control/Lube.
Great video, as always it's full of excellent advice and so detailed. I absolutely enjoyed every minute of it. I hope to find a gem just like this to have a go myself.
Thank you so much for your kind words and for watching!
Wow. Can't believe this .I have this unit along with the tuner. The 5002 Rt channel has stared to get very low. The balance doesn't help and is way off. Started looking today for help and no one knows anywhere to repair it. I'm at my wits end. Had this since 1971 and it's been great. Started looking TODAY for help and saw this. I cleaned what I could with Deoxit. Didn't help. Any advice would be greatly appreciated. Thank you.
It's always a good day when I see a new video, Chris...Thanks so much!
My pleasure! Thank you again for taking your time to watch.
I was always a kenwood fan since high school thanks for the info really learned something
Your very welcome. Thank you for watching.
Thank you for the great Kenwood amplifier restoration, Great job! Reguardind the WILM metal caps you used. Would you mind sharing what series of caps you use? Thank you again. Your videos are awesome.
Great video, many thanks for this comprehensive video 👍
My pleasure! Thank you for watching.
Gave one of these to my sister in law, she loves it...
Just bought a KA-5002 in Denmark, approx 1600,- NOK
Happy customer
I've got approx 120 Trio-Kenwwod units in my collection
Very nice! Thank you for sharing.
Beautiful amp from back in the day. I have a couple of Sony's I enjoy. The TA F3A & TA-2650.
Yes, she is. Sony made some killer audio gear back in the day. I have a few Sony pieces in my collection.
Nicely done. did I miss where you checked the +/- highest voltages for the power amplifier and all the low voltage values that are distributed to the various modules? And with a quick look, perhaps I must have missed the check on the DC balance of the speaker connections before you connected speakers. Many times the fingers on modules are not gold plated and need to be cleaned. On occasion, I've taken apart alternate action push switches because of intermittents.
Thanks for watching. I'm really not sure what I showed in this particular video. I just don't remember. I usually go through them pretty thoroughly but I don't always show everything in every video. Thanks again for watching.
I was thinking the same thing. No checking the DC offset?
Outstanding video. Thank you.
Nicely done! It's educating and entertaining.
Glad you enjoyed it! Thank you for watching.
Hi, the second video of yours I've watched and I think there really thorough, even including some company history of products being restored. I notice with a lot of videos like this that resistors are rarely ever mentioned. Ben Duncan in the eighties, writing for HiFi News & Record Review wrote an article on building your own quite sophisticated preamplifier. It was a really thorough article ( a good read) and one of the things he included was frequency response curves relative to the component parts tolerances. It showed quite clearly how very tight, even better than a percent affects the response. I know that this is a budget project but maybe one place to improve resistors is the phono section, particularly the load resistors to at least a one percent metal film type; still very affordable and should give an audible improvement. In one update to a high-end preamp that used 1.0% metal film throughout the design, I installed matched Vishay to 0.01% film and foil resistors ( I think $25.00-$30.00 a pair. I know, insane) in critical places like the phono section, it capable of up to 80 dB of gain to noticeable effect. anyhow, great stuff. Makes me want to pick up some projects to repair. I even picked up A Hakko Fr-301 on Amazon. But they're not $100.00 anymore.
Thanks for watching. Thank you also for sharing your experiences. The information helps everyone to make better decisions when repairing, restoring or updating their equipment. Your going to love that de-soldering tool!
If it sounds good to you, it's worth it. But I can't imagine anywhere in an amplifier circuit that a 0.01% resistor would make a difference. Transistor gain is going to vary lots more than that. You could always put in trimming pots in series or parallel and "tune for minimum smoke", as the hams say.
AMAZING channel! 👍👍👍👍👍
Thank you! 👍
Kenwoods are amazing. I love my KA-8006
They sure are!
I had this amp and tuner, bought used in 78 from Bob Hovland great amp. just recently recycled it.
Thank you for the history on the Kenwood company.
You bet! Thanks for watching!
Excellent tutorial video.
Buen video gracias por la información y ayudar a arreglar estos equipos de alta calidad de sonido,un abrazo desde el Perú
At 13:00, how about a link to that cross-reference chart? I've looked all over for it !!
When I google "troublesome transistors" the first link is the list. Maybe throw in "vintage audio" with the search? I didn't have to but when I did the same list came up.
@@vintageaudioaddict - Got-it!
This "hobby" is so much fun!
Yes, it is!
nice! That one looks really nice, love that silver face. I just got a Kenwood dual cassette deck model KX W892 in perfect working order and really great aesthetic condition for 12 dollars. Sounds pretty alright.
Yes, she's a keeper. Great deal on your cassette deck for $12.
I have this same Kenny but the 7002 spec. Absolute sleeper of an amp. Amazing built like tank and solid internals albeit requiring recapping and transistor replacement as needed. Using this as my main pre-ampnalomgside a Kenwood KA 6004. Open , dynamic, deep fine bass tube like sound with solid state reliability that can rival or even put modern amps into shame. Only downside is that finicky and tricky Null balance set up.
I like your history on the company. Would like to see you do something on superscope as they were the parent corp of marantz in the 70's
Thanks for the suggestion.
Kenwood had some great integrated amps.... I prefer the one's from 1969-1974.... I just picked up a minty KA-6000, which i think was one of Kenwood first S.S. integrated ... Inside the unit its very busy and made me think of a tube amp.... It plays nice,,, but wish i had the know how on and where to begin and replace old parts.
Nice Find! Just do a little internet research. There's a lot of info out there on most any piece of vintage audio equipment. Maybe that will help you figure out on how to proceed with your new unit. Good Luck!
@@vintageaudioaddict Mine seems very similar to this one your working on... Love them.
Yes, I thought the same about this amp.... but instead of "busy" the word was messy. It looks like the model they made just prior to this was a valve amp, aside of being riddled with those crap wirewraps.
I guess the performance level of this is like what my Dr says when we go over my perfect Cholesterol levels... "How does he do it"?
One top is take a sniff on the top air vents so it dint smell burnt😊
Guess what, a KA-4000 will cost you $450 NZ in New Zealand, it is very rare find aything worth anything that is a genuine bargain. I can only look on with awe as you buy and restore some gems into something some one can value again. I look forward to more reveals of equipment you have acquired, but can only watch as I know I can not do it here, well not on my pay grade. Love your content, always an education, and a dry sense of humour always goes a long way...
Kevin, greeting from the USA. Thank you so much for your kind words. A few years ago here in the states this type of equipment was being put out to the curb. Now for the most part bargains are hard to find here also.
I just bought a beat up ca 1010. So far, have both channels back. Seems like bad solder joints. Going to get into it this weekend
Nice! I think you are probably talking about a Yamaha. I have a CA-2010 in my collection. Good Stuff!
This is the model just below the KA-7002, which was Kenwood's first DC-coupled integrated amp. I owned a KM-8002, which is the power amp version of the KA-7002, for many years and it was a very good performer -- but I must say, as good as it was, I now have a couple of sub-$100 (including outboard PSU) Chinese "chip amps" that easily outperform both that KM-8002 and the "audiophile" Adcom GFA-535 that replaced it in my system back in the day. Audio has never been better in terms of price/performance ratio than it is today. Collecting vintage gear is a fun hobby -- and, for we old-timers, a nostalgic trip down memory lane -- but the best way to not "spend a fortune to get the great sound" is to buy carefully selected modern gear. Don't get me wrong, I still have a couple of mid-'80s Yamaha pieces in my system and much appreciate the thorough engineering and meticulous Japanese craftsmanship that went into them -- but if there were modern equivalents for sensible prices I'd happily retire them.
Thank you for sharing. I get what your saying. For me, vintage electronics is a lot like classis cars and modern cars. A lot of good can be said about both.
@@vintageaudioaddict -- Your videos are very nostalgic for because of the years I spent managing a busy audio repair shop back in the '70s. As a factory authorized "service center," we worked on thousands of Kenwood, Sansui, and Pioneer products -- not to mention dozens of other brands -- and it's interesting to see how nicely this particular piece held up after all these years, those problematic little transistors notwithstanding. Thank you for your work!
i used panasonic and elna in my Magnavox astro soinc 204 chassis and it sounded like new when i finished
Good Job! Video is very informative. Could you send a link to that transistor replacement list? Thanks
Thanks for watching! That list is on my network so I don't have a link to it. If you google "Troublesome transistors in vintage audio" something like it should pop up for you.
Very well explained, great job!
Glad it was helpful! Thank you for watching.
Hi,
About the stand-off terminal bars/strips .. what are they called? .. I couldn’t find any…
Where can I also find this transistor note list with replacement and known problems?
Great video. I have an old Sansui 661 that I bought in 1973. The FM tuner dial shows the stations about 10 numbers low, like 107, coming in at 104 on the dial. What would be the cause.Everything else seems to work fine.
Thanks. With your tuner if could something as easy as the tuning string has started to slip some. Bee's wax works well on the tuner string if that's the case. Of coarse it could be more then that but that's something you may be able to look at.
@@vintageaudioaddict Thank you for the reply. Yes, I think it's something more, because down at the lower end of the dial the distance of the discrepancy is less.