70s "Deluxe Bass Amp" - Who Made It? Is It Worth Repairing?
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- เผยแพร่เมื่อ 4 ต.ค. 2024
- I don't know what it is other than it's a vintage 1970s solid state Japanese "Deluxe Bass Amp" student grade 5W guitar head probably imported and sold in the United States by some random catalog or music store. Ok, well, maybe I do know what it is. But what's wrong with it? Is it worth fixing? Is this video worth watching? Will our soldering iron-wielding hero survive!?!?!
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Brad: “it’s probably not gonna be worth it”
Also Brad: *tests and replaces every component and goes out of his way to make it work*
You all prolly dont care but does anybody know of a way to get back into an Instagram account..?
I was dumb lost the login password. I love any tips you can offer me
@Caspian Emerson Instablaster :)
@Collin Kamryn I really appreciate your reply. I got to the site thru google and im trying it out now.
Looks like it's gonna take a while so I will get back to you later when my account password hopefully is recovered.
@Collin Kamryn It did the trick and I finally got access to my account again. I'm so happy:D
Thank you so much, you really help me out!
@Caspian Emerson Glad I could help :D
Matsushita is the founding name of what's now called Panasonic.
Also Technics and Ramsa
...a THOUSAND?!!!... 30:50
( i love that your daughter is so amazed about it!)
My Dad was a player when I was growing up and we had one of these laying around. I commandeered it when I was getting into guitar and electronics 11-12 or so in the early 80's. I believe "mine" had screw terminals for the speaker out though, I hooked it up to any speaker laying around to see what sound it would make. My favorite was a mid and horn from a speaker panel out of a dismantled Zenith console stereo. It made my guitar sound like a buzzsaw or, as I pretended, the Beatles Revolution sound. Not sure how actually close I was but it sure made me happy at the time.
I was a tech for over 20 years. Tubes to start with and later mostly solid state stuff. We used analog multimeters to do most of our testing of components. It's amazing how quickly we would find faulty components with an analog meter especially transistors and diodes and of course resistors and even caps through checking the charge and discharge rate using the battery of the meter in resistance range. Rarely needed to get a capacitance meter or component checker out (they used to cost a bomb back then). Do love watching your videos. Very entertaining stuff Brad 🙂
It didn't seem like you were stoked about doing the repair, but you have given that little box another chance to give it's next owners some enjoyment. Love your channel!
The level of annoyance in his voice ruined this watch for me and I’m sure ruined it for the owner, if he didn’t want to do it then why act like a little bitch instead of declining to service and not making the owner feel like an idiot..
30:22 "Wow look at that smoke...yeah don't breath that in..." haha. That is the first thing that my dad taught me about soldering.
same xD
Great video! I just got one of these broken at a flea market for $5. Was able to figure out from the video that my fuse wires were disconnected. Resoldered them and it worked like a charm, great tone! Very helpful, thanks!!
Glad it helped!
Dude, that was great! I could watch you troubleshoot for hours.
Just wanted to let you know that your channel has helped me a ton in my studies so far! I just started my undergrad in Electrical Engineering and it is my dream to work on and design my own amps. I've learned more from watching your videos about amp diagnostics and repair than I have in any of my classes thus far and I really appreciate the fact that you go through every step of the process. Thanks so much!
Of course he includes Dive in his bass demo, love this guy.
As someone else mentioned, it is made by Kingston. I have the same amp with a 2X12 cabinet. They were some of the first imported amps from Japan in the mid 60's
Hi! Brad, I bought this very same amp when I was 16. It was in Sydney Australia 1971, We later went to England and eventually sold it, along with my Burns of London Nu-Sonic guitar. I believe the guitar and amp ended up with the band 'Echo And The Bunnymen'. I forgot what it looked like until your video. Still playing, still rockin'. Much respect.
blackmore56 cool story!!! I love the Bunnymen
Echo and the Bunnymen, man I haven't heard that name in a WHILE. Cool band.
That Kingston bass sounds somewhat Rick 4001-ish. I like it :)
Peavey T-40 basses from the late 70's to mid 80's can also get a pretty close to a Rick tone, but they are boat anchors. At least 12 or 13 pounds.
That was worth a video for sure. Nice fix Brad.
Man your channel is relaxing much like arts and space music Sunday night in the 90s and you might learn something before it's done.
Thanks for saying so, Chuck. I appreciate you watching and taking time to comment.
I was just writing a comment while watching, about how cool i thought that tester is when you stated that very thing, so i guess i'll just say i agree that is a kick-ass tester. It's display nearly blew my mind, didn't know there was anything like that out there.
I’m fascinated by what you do. Once I start watching I can’t stop and I’m not a guitar player, I play drums.
First off it's educational and wonderful that you rebuilt this amp and I'm sure it's a solid 50 watts output.
The problem is, with modern bass cabs that trade off efficiency with extended frequency to cover low B and smaller high power handling cabinets, this amp doesn't give much headroom to play that loud.
That being said, a 4 ohm 15 inch woofer mounted in a properly tuned cabinet with a frequency response wide enough for a 4 string bass or guitar, will put out plenty of volume.
I don't know who this "michael ferrad" is but he sure seems to help out when it comes to these hear amps..thanks Mr.guitar man ..for ur expertise.
I have a guitar head that looks very similar, it's has reverb and tremolo and says “FET - All Silicon Transistors.” All I could find about it is that it was sold under the Wabash name, with the name on the cabinet and not on the head. It may be a cheap "throw away" and some may hate on it, but it sure sounds good to me and the others I jam with, and I would never get rid of it. It makes a great little blues harmonica amp, which is what I use mine for! Like they say, one mans trash is another mans treasure!
I have a Wabash Archtop guitar in my collection. From the 40s. Needs work.
You did NOT like this bass amp until the last 10mins of the video...or so.
I could tell especially at the beginning that you weren't sure you were gonna continue. I'm glad you did though because it kept me entertained for 45 minutes. : )
Thanks
Oh mah Gah 🤪
That Nirvana riff off Incesticide sounded so good on that amp. What a tasteful choice. This guy is the total package.
Awesome video. Resurrecting the dead never gets old.
Glad you got it fixed, nice to have your daughter chime in.
I cut out the part where she was pointing at random components and asking me what they were. My explanation of transformers was pretty good, I must say.
I had a "Cameo" Bass that was similar in the 70's. Your kid is a ray of sunshine you a very lucky to have a nice family.
Thanx so much, Brad... another winner...
love that wee tester... cool
I'm trying to build up funds for a multi-meter with a capacitance function...
Didn't know they existed 'till I saw yours and Uncle Doug's...
thanx again and cheers
I had an AceTone Bass head similar to this. Had great tone and power for me til I met Mr Ampeg.
You have way more patience than most of us Brad. Thanks again for posting.
As a technisian and also degree trained Electronics engineer it was really great to see a competent guy at work as so many on here are just blah blah merchants. I am so jealous of that tester too as that is FANTASTIC, but not for long as i am buying one of those babies TODAY. i also thought the signal injector was super neat also as it means not having to have a big old sigal generator unit like I used to use at college in the 90's (70's era gear). Micro electronics finally used for something useful....Loved this video as no one ever knows it all and its always good to see someone else work and using their competence and logic...Very good video. Gonna subscribe won't often hear me say that on most things on TH-cam as most things on here are a waste of the viewers time...SuperCool...liked that bass too...Thanks for taking time to make it...Top marks...
Always fun to see the testing and diagnostic steps. Plus....I used to have that SAME BASS! Mine was sold as a "Kent" at one of the department stores up here in Canada. Possibly Eaton's (now defunct).
Good vid. Shows how nickle and dime type parts can make things die. And how knowledge and experience of how to fix things can resurrect electronics. (And why labor is worth more money then just the parts themselves.)
The tone produced by the signal generator is just above C# 4. Some of the buzzing/humming produced by his probe (oh yes😉) is exactly an octave lower.
Now THAT was a fun follow-along! Good job of explaining your thoughts as you step through your process of elimination. He sent it to the right guy, for sure.
That's the bias pot. I oreded mine from "House of Imports" in Detroit for $59. It had a 2x 12" cabinet.About 25 watts.
" I think, just for shits & giggles...."
"daddy!"
"sorry, dear...."
btw, I bought the little component tester, & now I'm kicking myself that I lived without one for so long. wonderful, & silly-cheap.
I use USPS. FedEx has delivered many items with shipping damage. They also "lost" packages that have still not been replaced or covered for the monetary loss. I mostly ship live day old ducklings and goslings. USPS has not ever delivered dead birds to my customers.
Very creative electronics by the way. I remember matching caps using the series/parallel method. Yes it looks "ghetto" but sure works really well. I have always liked discrete transistor circuit design. These days I use the new "tube logic" Roland Blues Cube because they sound great, weigh much less, and the best part...... No more tubes to buy.
Brad.. thank you!!!
I have a Crestwood amp from Japan with a very similar board, no model number, no schematic. The only photo of it online was the guitar center listing from the store I bought it from. Lol.
The board traces and rubycon caps are all the same. Mine's trem is nonfunctional, and it hums. After recapping I'm checking the transistors to see if the volume is all it can be as well. Good info!
in 1972 i had a guitar and amp just like this and they were made by a company called winston. the guitar was a red teardrop whith a great neck. Phill A.
Very interesting video. I always like the ones where there are lots of question marks. (Precious quality daughter time is a bonus.)
I enjoy her company.
it was fun to watch the fix..!
Ordering one of those component testers right now. Wish I had ordered one a week ago so I could play with it now. :D
That tester is otherworldly ,your the perfect owner.
I enjoyed seeing how to use the Signal Generator to trace the problem. I bought one from Banggood after your initial video on their products. Also picked up the ESR/Component Tester and the mini Oscilloscope.
Glad you fixed it. Pretty much all had to be replaced but still a nice little amp.
Much respect - love watching the masters on TH-cam work. Only experience (and the brains to learn from that experience) allows the diagnosis/repair of a solid-state circuit without the schematic. No joke, that was impressive. I think it’s interesting that the kids today are clamoring for the ‘70s era MIJ junk - mass produced for sale by the catalog companies like Spiegel and Montgomery Ward -or found for sale at piano-organ stores that wanted to say they offered guitar gear (but were still Uber-lame LOL). We all cut our teeth on that stuff. I never learned how to chase down bad caps and output trans - but I *did* learn how to resolder stuff on the fly by flashlight - between sets LOL. Thanks to your resolder alone that amp is now the most reliable and ‘giggable’ it has been in 40+ years.
I used to have a “ shoebox “ Kingston Guitar amp- one knob- volume- it rocked!
Good on ya playing 'Dive' to test the bass amp out!! haha
looks like a nice little old kit amp. you can learn a lot from those.
At least they labeled the PilotLight!
haha...I would have never known what that was.
I have accounts at FEDEX and DHL for importing from various countries to Oz and price wise are very similar. However, FEDEX actually do the customs clearance when a shipment changes aircraft in Hawaii, thus a quicker delivery time with no clearance required in Oz.
BTW this was an enjoyable and well explained repair to the "deluxe" bass head. Keep up the good work it is appreciated. There are now ads played at the beginning of your episodes, I hope people just let the ad play so you get a good return on monetizing your work.
Brother Brad- The elder daughter has an awesome speaking voice. Hope you got her singing some tunes.. I'm sure you have..
She tries, but I don't think she got the music gene. The other one though...
Not surprising the caps were bad. The electrolyte in them most likely evaporated a long time ago. It's a trip seeing old electronic.
Nice job... practically a complete overhaul. I think I would have selected a 1A fuse, for longevity... I'm sure it will be fine tho, as long as it's a slow blow one!
It requires a 2 amp fuse on the cap of mine
80.00 or more work for a 10.00 amp. I love it! As soon as you dug in I thought "Oh yeah, he's gonna go all out on it". Well done sir.
Your hair looks better than mine (most of the time). Nice job on the repair. I need to dig out my SUNN 100 twin channel and clean all of the pots. I use it with my 18" BFI cabinet for my bass guitar.
Thanks for making Monday a little less.. Monday :)
Glad you got it fixed! I dig that bass guitar! It sounds great and looks great!
Thanks dude! Late 60s Kawai Kingston from Japan.
The Guitologist Awesome! Where did you find such a gem?
Bought it locally. Sometimes I get lucky on Craigslist...but not in the way you might think.
Lol! I did a search for these on Reverb and then realized you're selling it! Too bad I'm not in the market. What surprises me is these basses having a "zero" fret! Didn't expect that on something so early.
14:44, Brad too much! Is that a chop stick? LMFAO
"it looks ghetto as shit but it's gonna do the job." Well this was literally me soldering together resistors to get the right value today, even the electrical tape wrap is on point.
I thought his work was pretty tidy too.
Yo brad.. you look fine in the vid man... especially the sick "the Warriors" shirt!
I disagree your component choices methodology however I have to acknowledge your resourcefulness of technique and understanding on amplifier circuit technology. Thumbs up Brad and keep teaching us using that component tester. They are fantastic! I know, I bought one too.
Greeting from Malaysia
Kingston brand. Now you've played through the matching amp!
The two 0R51 resistors are emitter degeneration for the output transistors. They are fine.
The diodes were biasing the output transistors, I wouldn't change them out for different types, you could either go straight to class B or toast the output transistors depending where you end up with the Vf of the diodes.
Check if the VR trims the output to 1/2VCC or if it trims the quintescent point.
Then trim it up and close it up :D
@The Guitologist I see there is a Kawai bass just like yours for 4 bones. I LOVED my Japanese CROWN SG bass more than my buddy's real Gibson. I'd actually put a '73 Gibson pickup in it. Well it was stamped Gibson into the pickup chrome cover and another friend who used to work at the Gibson factory said they only did that for one year. iirc it was 1973. Check out the *The Rambos - "New Shoes" - circa 1975* video. You'll seea gold one on an SG guitar. Btw Dottie Rambo was an incredible song writer. *Reba Rambo 'Songs Mama Taught Me* is a true classic album! She used the best Nashville players. sorry to ramble a bit, was going to erase it, but accidentally hit enter. oh well lol
I’ve got a guitar amp that’s the same cab and chassis. My dad got it at Sears and I’ve always thought it was a Teisco. It came with a 2x8 cab with not too great speakers lol. It has tremolo and reverb although the tank is bad and I haven’t found another, it’s a tiny little spring tank. It’s not much of a amp but my dad used it for a bedroom amp and he gave it to me when I got my first electric guitar so it has value to me because of that.
I'm glad you decided to repair. Very interesting and enlightening vid.
Good video-glad you are teaching your daughter-these skills are hard to find---
No need to blow fuse after fuse if you had a Sencore PR570! You can set it to cut off below value of fuse, You seriously need one for several reasons. Robert
44:13 Damn, bringing out the deep cuts
You are amazing! Great work and great video!Thanks!
I have an Accousic Bass amp. I usually check all the Caps and transistors on the power amp side first. this time I didnt check a 1000uf cap. it measures 1320uf I didn't have an ESR meter. I swapped out the cracked fuse and set the Variac to 40VAC it sounded raspy with a sig in the pre. I cranked it up to 120vac it worked for 5 minutes and smoked one of those .5 ohm 5W resistors and blew 2 pwr transistors. I ordered an ESR meter and 1000uf 100v Cap Sure enough it was the 1000uf highly leaky. This is a 42 year old amp. So axial caps are hard to find. I cant say enough about getting an ESR meter for caps. Looks like all the electrolytic caps could be bad. I suggest checking the power amp first If I would have done that I wouldn't have smoked $30 worth of transistors and caps saved a lotta time. Great video BTW
Great job. Love your work and teaching ability.
Marcus Jones thanks Marcus.
"That is a miracle and miracles are way things ought to be."
YOU ARE A LEGEND MY MAN
Nice work. I enjoyed watching your troubleshooting process. Thanks.
Very interesting vid. Liked it a lot. Right up there with a relaxing Bob Ross oil painting zone out vid. Which is a good thing! Thanks for the upload. PS. I was diggin’ the sound of the bass guitar big time... Ernest in Lexington
Great TS work. I bought 3 of those part testers (one went bad on me). Also have 2 of those function generators kits. Plus have 2 frequency counter kits, To see what frequency I’m generating.
The board looks just like the board I did when I was undergraduate ;-)
I enjoyed seeing that component tester, and see how components failed. I have some electronics background, but don't work to component level regularly. Great job
Thanks for the Bass info, I Was wondering, very nice.! Another great video too. Cheers.
That component tester looks really useful to have! I ordered one. Couldn't believe it was only 10 bucks. Dang.
It looked like you forgot thermalpaste on those transistors. Great video.
Those testers rules! But i usually test twice because sometimes has weak contact and show crazy results.
I think it's better bypass with resistors those 1000mf 35v caps to avoid any issue later, Just saying. Great fix and sound overall.
Im sure alot of people are like me and dont have ups or fed ex stores nearby. Usps is about the only convenient way for us to ship things.
Dive! Dive! Dive! Dive with me!
Man, that thing was really, really broken. Nice fix.
Those brushed stainless knobs are pretty cool.
Great job on that one Brad. You fitt it!!
I say it's early Japanese, how far they have come. That assumption is because of the amount of Japanese components. It's got that vintage Japanese electrical appliance look about it.
*SUPPLEMENTAL*
I guessed it was made in Japan before Brad announced it. Thanks Brad.
I have a little dc protect box for in between amp and speaker, saved me hundreds of pounds in speakers over the years.
Sweet Dive playing and a nice dive into a solid state amp
Always nice to see to be corrective about incomplete & cold solders!
Yeah you are rockin the hair bro.
My family had one of theae amps in 1971 . we also had the matching 2 12" cabinet We used this amp to power a Heathkit Jaguar combo organ!
I love how you started with 'if it takes more than an hour....' then you spend about 4 hours on it... hahaha
great fix, though!
I could almost smell the ozone from here. Great vid.
The 2N3055 is a good, affordable generic NPN power transistor. They also make a good pass transistor in regulated power supplies. I used to buy them a few at a time from allelectronics dot com.
You had me pretty impressed with your expertise, and troubleshooting ability, but when you start grabbing salvaged output transistors, you lost me. And BTW ,transistor with 2SA prefix are PNP, and ones with 2SC are NPN. The 2N3055s are generic output transistors used in a lot of low power, lowend amps, in the 80s and 90s. I was a tech for 35 years, just so you know where the criticism comes from.
Another great video! Love the shirt!
Thanks, George.
Great job Brad on that old Kingston amp. I have a few lawsuit guitars Kingston made..!! Love those Ghetto Caps..!!
20 minutes in i was dumbfounded as to why you had not checked the power supply properly.
With transistors first thing i do is disconnect the tranny from the board. Then meter the diodes and caps for shorts. next is the finals, (main output transistors) lets continues the vid and see what happens, fix it no matter the cost, that thing is so cool.
You're right. I knew the output transistor(s) were probably an issue, And those Rubycon have always been junk when I've come across them. Just decided to go ahead and check the preamp first with the juice up about halfway. Took the scenic route.
" dumfopunded " What a great word. I'm going to start using it from now on!
I always check a SS amp with no load and monitor current w/ a variac on first power up. At that point I always make sure the output does not have DC voltage on it before putting a load on the amp. I was curious if Brad had measured for DC volts on the output off camera at the start? Most solid state amps don't need a load on the output unlike tube amps. Very cool video still the same and was happy you got the amp working again. 2N3055 transistors were an excellent choice for the repair.
Ringo Starr There would not be a voltage offset at the output. It's capactively coupled.
Not all quasi-complimentary amps are designed the same. I agree that a typical quasi design will have coupling cap but look at Silvertone 1465 or Hartke A30. Even then the cap could be old and leaky.