Sansui 9090DB Receiver Restoration Overview, Dolby NR Demo, and Bench Test
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- เผยแพร่เมื่อ 26 มิ.ย. 2024
- This receiver has been featured in an article posted by Sound & Vision!
www.soundandvision.com/conten...
This video is a complete overview the Sansui 9090DB Stereo Receiver, including general information, demonstrations, restoration outline, and bench testing.
00:00 Introduction
00:50 General Information
01:23 Model Comparison
03:39 Front Panel Control Review
09:46 Dolby Noise Reduction
18:07 Rear Panel Review
19:40 Inside Look
21:24 Restoration Review
31:15 Power Output Test
References:
Orion Audio Blue Book 2001
hifiengine.com - บันเทิง
I've owned 3 - 9090DB's. Still my main receiver. Had it totally restored a few years back. I've never had a problem with any of the DB circuits (knock wood.) "An Important "FYI" for anyone who has one or is looking to get one"... The 9090DB does not like speakers that are "not" rated at 8 ohms. I've learned the hard way. I was running a pair of "OHM Walsh 2's" rated at 6 ohms & blew some fuses & output transistors. Luckily I have a new tech who does great repairs at great prices who took care of me & I can always count on with any of my vintage equipment.
Can you share your tech's contact information? I would like to reach out to him if possible.
This might be the best video on a receiver restoration that I've ever seen.
Thank you for the support! Comments like this help keep me motivated to continue creating content.
I agree... Excellent video!
Wow, this is one incredible and detailed video! The 9090DB is a beautiful monster unit! Thanks for sharing!
This is an excellent video on how to do a correct Restoration on old vintage receivers You're probably one of the best technicians in the country hands down ! I have learned so much from this guy.
Masterpiece, it looks in mint shape!
You are an excellent, well spoken communicator. Thank you for the video.
One video answered all my questions. Great job!!!Thank you!!
Glad I could help. If anything else comes up that I did not cover let me know.
As a lover of vintage audio I enjoy your videos, despite the fact that after about 2 min I'm usually well out of my depth. Good stuff.
Great video man! Thank you. I dig your bench setup. I’m learning how to repair and look forward to having good test equipment like that someday.
Awesome explanation of content 👏
Buddy had quad with 4 Fraziers and a dual turntable....it was phenomenal...Sansui ..ugh great memories
Great job , thanks for the video
I feel validated, I have most of the receivers you showcase and discuss, This one, G22000 and SX-1250! I went from Stereo hoarder to quality collecting. I did sell the CR-1020 though.
Damn, that is a super clean unit.
Gorgeous!
Superb, superb, superb video. I'm an electronics technician and I routinely take my stuff apart for PM and sometimes just for fun. It was really great watching such an in-depth and informative presentation. BTW, though the Sansui is a great receiver, I dearly wish I had my Pioneer SX-980 back. I loved that thing. Thanks, Ben.
Thank you for the support. Check out my 1250 video if you really want some more Pioneer Nostalgia.
@@NovaluxStereophonic I'm already there! Thanks.
get one just save up and or sale something off if you can ye only live once .sansui sp1500 speaker go great with it
Excelente trabajo
Your thoughts on the sound specially compared to others will be really appreciated iand will make your videos that much more interesting Thanks for sharing
I appreciate the comment and will consider it in the future but I do not generally like to inject my personal preference as each persons perception of the overall Sonic’s of individual pieces is subjective.
@@NovaluxStereophonic understand your point, however i don’t see anything wrong with sharing your knowledge and experience with the units, you could potentially save many hours and lots of money potentially just by sharing your honest opinion. thanks again for your time
I have one of these and I need to get it checked
I just found your channel. Subbed and enjoying the videos. My son located a Sansui 5050 receiver in absolutely mint condition a few years ago for 75 bucks and I bought it. It is awesome.
I re-pinned the Dolby board myself. Fixed all the problems. To be honest, I was shocked it worked after I finished. It’s definitely a long process.
giving a like just for the first 30s of video
I just found you and really enjoy the videos. I have to watch more recent videos, so maybe you use it, but can I ask why you weren’t using your QA401 analyzer over the other one you were using? I also saw a video where you were using one of the Panasonics. I ask because I’m planning on getting either the Q403 or Q404 if it ends up getting released soon. I was considering getting a Panasonic, but at 2-3 times the cost I’ve been told by many that the Q403/Q404 is a real bargain.
I have only used the QA a handful of times. What I have found is that it is more suited for production environments. I prefer being able to grab and turn knobs and buttons rather than manipulating software on a computer. I think it’s main advantage is in plotting frequency response but I have been able to get by so far with the bode plot features in my Siglent scope and signal gen. As a bench technician I don’t want to be using gear that slows down the process but I could see how the QA would be an excellent tool for an engineer.
Great Video!! thank you very much, Can you please tell what moden subs did you use to replace the 4 2SC1400 which are at the main in F-2624 board? and what replacement chip did you use replace the FM chip (mine does not have a stereo reception) thank you very much
The F-2624 is really well documented on Audio Karma, best to go there to verify as there is much more context and discussion which is hard to properly convey in youtube comments. For the FM chip it's not good to rush and replace that. The issue needs to be diagnosed and isolated by a professional. It could be something simple like a burnt out stereo indicator lamp. A good way to check for that is to tune to a strong station and flip from stereo to mono and listen for a distinct change. If no audible change then you may indeed have an issue receiving stereo.
One came up for sale locally for $1500 dollars. I don't see it lasting too long. But this one looks pristine.
I was told my unit is the one in the video. The faceplate does show the same blemishes. It is currently paired with a pair of jbl 240ti’s. Recently ordered Cornwall iv’s. Looking forward to hearing then
Hi Tony. If you want to send over the serial number I can confirm.
@@NovaluxStereophonic It is the same. The sticker in the back lower left panel (At 18.08 in your video) is the same with the same number!
@@tonywarwick9240 Very cool. It will also be the one featured in the Sound and Vision article in the video description.
I love them Sansui`s play some RED or Fireflight lol thanks for video man but i had to poke at you a bit with that music but yea YT and its rules limit what we can play😁
Hello, Thanks for the great video- Quick Question- If you fire up the unit w/o the Driver board, what does the Protector light do? Blinking Red as well? Also, w/o the driver board AUX, AM, FM Phono 1 and Phono2 will not light as well when the input selector is turned ? Thanks!!
I don’t have one of these in front of my but my recollection is that if you pull the driver board the protector light should go solid green. The input selector has nothing to do with the driver card and should not affect them one way or another.
Do you have any recommendations on someone to rebuild one mine only works on auxiliary bought it that way. its sounds awesome. A lot of power. I'm hoping you work on them you sound very professional and proficient. Thanks a lot for posting sir good video😊
You can message me via my Facebook business page. It’s not cheap work as this is a high hour restoration but a very nice units when they are fully gone through.
@@NovaluxStereophonic okay thanks sir I do not have Facebook I will pursue it through a friend's Facebook soon thank you.
Add Pioneer speakers of the same vintage, and you have the perfect stereo system... to which all others shall be compared! ;)
I do have one hook to a pair of good Pioneer speakers the best I've ever heard
I still don’t understand the tone toggle switches. I understand that centered is defeat but I find it hard to hear a difference when changing the position of the toggles. Hard to critically listen while standing at the unit in plane with the speakers. Is there a recommended position that most are using? KEF 104/2 speakers. I’m running a Phase Linear 400 with the 9090DB as preamp.
Mine was serviced this year and LED upgraded. Within a couple months I noticed uneven lamp dispersion on the left power meter. It occasionally flickers but half of the left meter window is out. Is this more likely an issue with the lamp or the installation? The tech is a 5 hour drive round trip and I’d need to leave it and make that trip twice. I’m assuming this isn’t something I could tackle myself.
Excellent video by the way. Geared more toward the technically gifted but as a hobbyist, I still learned quite a bit!
In a well designed piece with all tone controls to zero you should hear very little difference when flipping to and from defeat. An experiment that you can try to better understand the defeat control is turn bass full CCW and treble full CW. Flip the defeat controls and you will most definitely hear the difference when tone controls are bypassed.
Recommended settings. Start with the tone controls in circuit (not defeated) then rotate then one notch at a time and tune to your liking also don’t forget about loudness. If you listen at very quiet levels most of the time you may really like how the unit sounds with tone controls at 0 and loudness on.
For LED it is possible that the LEDs do not like the reverse voltage from
The AC supply and one has failed. I have seen the same issue in one of my units. The customer is dropping it off to have it checked soon. If the LED did indeed fail I will be swapping it to a dual LED same as I use in the indicator positions. Check out my video on 8080 LED installation. That will give you and idea if you would like to tackle it on your own. I would assume not, most difficult lamps to replace are the power meters.
Vintage Stereos did mine outa Oregon hear of them ? Good i hope
If it’s QRX restore you picked well.
My sister-in-law has a 9090db. When you power it up the red protector light blinks red and never goes to green. I watched the video (well done) and saw that the resistors in the driver board should be replaced. I will try to locate a technician in my area (outside of Nashville, TN) to fix. If anyone knows someone please let me know. Also while the power was on it made a pop sound and then I smelled something. Wondering if that was a resistor or capacitor burning out? Thoughts???
I hired painters to paint a friends living room. They had a 80’s Classic stereo system
amp receiver turntable ideal tape, 5 CD player. The painters put everything outside under a tarp and cook it for a month or so under the hot California sun. I thought I would replace it as the painters would not. I purchased a Sansui receiver9090DB like the one in this picture. It was working when I bought it from the shop in Sausalito, but it took. Me about 10 years to get around to hooking it up. Can you recommend a restorer in the Bay Area that could take a look?
If you are in the northwest you will want to contact QRX Restore in Eugene, OR
Could I get the specs on the mega resistor for the tuner power section please?
It’s always best to have a little context. I would encourage you to review this post and maybe a few others on the same topic before making the modifications to this area of the circuit. The common value that is used is 200 ohm 20-25W
audiokarma.org/forums/index.php?threads/990db-9090db-f-2619-power-supply-board-is-roasted.913037/page-2
Kicking myself in the ass for giving it away 20 years ago
Hi. I’ve got one of these that I just inherited from my late bro. A little soiled, but really in pristine condition. Honestly, at first glance I didn’t know what it was it sat there for days while I was clearing out his house. One night I was just sitting there looking at it thinking man that thing looks really nice. I’m gonna see what I can find out about it. 😳😳😳😍. I am not yet sure if I’m gonna keep it and have it fully restored or sell it and hold out for a fair price. All I know is that it does power up but I have not got a pair of speakers to attach to it. Any suggestions as what to do on that front? I really can’t spend much on speakers at this point I really just wanna try it out.
These are the first two steps. 1. Power on with nothing else connected and see if the protect light turns green. If yes, 2. plug in a set of headphones. You may need to purchase an 1/8” to 1/4” adapter but this is much cheaper than buying speakers to try a basic test. A simple pieces of wire attached to the 300 ohm antenna terminals should get you enough signal to pull in local radio
@@NovaluxStereophonic thank you! I will do that.
I’m lucky enough to have this receiver. I have a good pair of speakers hooked up as well. Can I hook up a modern tv to it to play the audio out of the speakers? If so how? Thanks
Most modern TVs have an optical audio out. You can purchase a small digital to analog converter and then hook up to the Aux or a Tape input. Make sure to set your TV for external audio and Dow mix to stereo. Good luck!
@@NovaluxStereophonic oh perfect thanks 🙏
I've read that a lot of the 9090db Dolby goes out,does that effect the whole unit to play using Aux or phono for just music?
Yes. All signals run through the Dolby board, even with Dolby control in the off position. If the board is bypassed electronically the tape inputs will no longer work, Best to have the board repinned and any old ribbon style cables swapped if damaged. Apparently some shops have figured out how to bypass it without loss of features other than Dolby but for an experienced tech with the proper tools the Dolby card is completely serviceable. Once the design flaws are addressed this circuit is reliable.
@@NovaluxStereophonic Thank you so very much for taking the time to answer me back I truly appreciate it also I really like your detailed video on the 9090DB great information.
Novalux stereophonic , where are you base ? Are you in Australia or USA ?
NYC USA
Just had mine done by guy in Oregon paid have LEDs still same bulb out works scared touch dolby switch spose to by pass it
Why replace capacitors that are not out of spec ? I am of the opinion that if it is still in spec than leave it in. Is there a good reason to replace good caps?
Electrolytic capacitors have a limited lifespan. Some hold up better than others but all will eventually fail. The main contributing factors are time and heat. I primarily perform full restorations for customers that expect the units to run trouble free after restoration. I do occasionally offer break/fix repair for local customers where only replace failed components but shipping cross country and not doing the full recap is a recipe for trouble.
In short it’s just a matter of preference. If it’s your unit and you are servicing it for yourself only replacing out of spec components is perfectly fine.
I have a 9090db that needs some work, do you work on them?
Please reach out to me via my Facebook business page and we can chat.
Hi, quick question. I have a kenwood integrated amplifier with 125 watts per channel in 8 ohms, 350 watts power consumption and 110v. I use an AC voltage regulator rated at 500 watts max. I noticed when loudness is turned on with the amplifier and the volume control is at 8 oclock I hear distortion. I hear the woofer popping, my speakers are rated at 6.3 ohms 150 watts and 88db sensitivity. My question is, does the low power ac voltage regulator causes the distortion? I hope you can answer this. Thanks in advance!
Hello, there is not enough information here to accurately answer your question. Please clarify why you are using an external voltage regulator. Are you in an area of the world that uses a different AC mains voltage than the device?
@@NovaluxStereophonic I live in the Philippines, our main AC is 220v. My Kenwood amplifier is from Japan rated at 110v that's why I use a step down transformer to convert the AC to 110v.
@@doubleblindtest4649 I do not think your step up transformer would contribute to the distortion. You should take your unit to a professional for diagnosis. If your amp has preout main in jacks a quick step to try to determine the root cause of the failure would be to remove the jumpers and feed the amp section with a different preamp or variable source and feed the pre out to a different amplifier and see if the distortion follows either or both sections.
hey there my friend how much would you charge me to restore my denon 2802 AVR amp? it has no sound coming out the speakers.
Sorry, I do not service AVRs
I have a Sansui 9090DB that has been sitting around for the past 22 years... always wanted to get it restored but cost and being able to find a trustworthy technician has kept me from moving forward with the project. Another amp in my collection is the Kenwood KR 9600 that has the separate "quadraphonic component?", that amp was working just fine so not sure what restoration may be needed? I somehow have collected many other pieces of audio equipment over the years that just take up space in storage, sad to say as I always hoped to listen to a good audio setup.
Feel free to reach out via my Facebook business page if you would like to chat. I have worked on both models and may be able to point you in the right direction.
Hi. I have a 9090DB that has issues and I am having trouble locating a qualified technician. Do you do restoration? Thank you!
I currently only accept 9090DB restorations from customers located within drop off range of NYC
Thank you for your reply. I would also prefer to drop off. I live in Myrtle Beach, SC. You wouldn't know someone in Raleigh, Charlotte, Charleston, or even in the Atlanta area?
@@NovaluxStereophonic
Is Sansui the only receiver that has a midrange knob?
There are many receivers with midrange controls from other manufacturers. The Marantz 2270 for example has midrange.
I have 4 of these and a 990DB and a few 8080Db and 2 9090,s and 2 G7700 and a G6700 and a G5700 and a 7070 and a few QRX models
How much does it cost for a rebuild/restore on a Sansui 9090? parts and labor.
Please send me a direct message via my Facebook Business Page.
I have a Samsu amp that needs repair. Are you available
At this time I am only accepting work from local customers (NYC area) and only work on select models. Mostly the units shown in my videos.
I found a good deal on a 9090DB that’s been serviced (caps not replaced). That Dolby board kinda freaks me out based on some service headache threads I came across. Is the potential of that board going out enough of a good reason to stay away from this receiver?
It depends on the price and if you have a qualified tech in your area. Great receiver if you can get it up and running properly.
@@NovaluxStereophonic Thanks for the quick reply. The seller has a local business and has a good reputation. He said it’s functioning properly and is offering a 30 day return period, 90 day warranty and he’d help me out (reduced replacement cost) if caps have issue in the next year. $1400. I see that price on eBay for one’s labeled as parts only or for repair.
@@NovaluxStereophonic As far as qualified tech in my area, no idea. I’m new to the world of vintage receivers. I’m in the San Francisco area. I would guess someone must be around here, but also noticed you suggested a place in Portland to someone else in a different comment.
@@johntazbaz1121 You could try QRX restore, I believe they offer an option to bypass the Dolby board while maintaining the original selection features.
@@NovaluxStereophonic I think that’s the one I saw previously. Thanks again.
Can you run two sets of 4 Ohm speakers on this unit?
Yes. If connected to A and B the effective load on the amplifier will be 8 ohms.
@@NovaluxStereophonic
Thanks for your reply. So if I use the A+B mode it will be fine & registering to the amp an 8 ohm load. At what wattage would the amp present? More than 125 because of 4 ohms or since it’s going to register an 8 ohm load, still 125 wpc?
I’m picking one up in a few days & I want to set up my Ohm F’s & canton ergo 70’s. There is nothing on the net or in videos that explains that. Excellent content as well! Keep up the channel!!!!
@@stinkenstine The spec sheet for the 9090DB does not give a power rating for 4 ohms but the owners manual indicates the you can read 4 ohm loads on the meter by doubling the output power measurement so we can infer from this that its OK to run a single set of 4 ohm speakers and the amp should be capable of delivering over 200W of power into 4 ohms. The next time that I have a 9090DB in the shop I will try to shoot a video of an output power test on a 4 ohm load to confirm. For your application in A+B mode the amp will be able to deliver about 125W into the combined load, though you may be "better" performance running just one set at a time. A or B. Hope this answers your question.
Wow! It does answer it. Thanks again for your knowledgeable response. The gentleman that is selling me the unit is a tech and is looking into this as well and his answer is similar to what you are saying as well however, my Ohm F’s impedance is rated at 4/3 Ohms which is odd too me & in that suggestion I should just run one pair however I’m running both pair on my Pioneer SX-1010 & it sounds phenomenal however I could possibly harm the amp in the long run. I listen at low to moderate volume which probably doesn’t hurt the amp much but, I guess it’s not a great idea to be doing this. Again, I really appreciate your help on this as there is literally nothing out there on this topic. A video would be great on this! Thanks 🙏
I found this model in a box as well as some pioneer HPM-1500s that were out for trash for the bulk pickup that happened today. The speakers need to be refoamed, but work otherwise.
I was able to get sound no issues with the speaker protection, but all of the sudden, there's no sound. I have the RCA terminator plugs in phono 1 & 2's right channel.
Any ideas as to why the sound just quit out?
PS everything "looks" to be working fine, speaker protection clicks on and stays green.
It’s probably something simple like dirty controls. Keep the volume low, make sure the speaker selector is on Speaker A, then rotate the controls and knobs and see if it cuts in and out. That’s where I would start. Anything beyond that requires more advanced Troubleshooting.
I am a collector. But I am also broke. Hence my collection is complete with one low end receiver.
Trying again, and my comment was deleted, why🤔 I'm wondering about the spec on the metal/aliminium resistor you put in the Sansui 9090 DB
Regards Tore.
This is covered in detail on Audio Karma. Search F-2619 Roasted and you should be able to find the thread.
Thanks, find it.
Interesting, the 9090 was 137 output and the 9090DB is 153 output 16 more watts. I wonder what a Pioneer SX1250 puts out ? Pioneer advertises it at 160W. but I know it's really more than that.
To meet the FTC rule they specified at 160W for SX-1250. Check out my video on SX-1250 max clipping power to see what it can do on a straight power test.
i really would love to have my Sansui 8080db receiver restored ! fully would u help me i will pay very very well i want it done right and know u wil take care of it .
Hi Johnny. Please reach out to me via my Facebook business page and we can chat.
👍👍😎✌️🤟
Found mine 5 years ago for $20 at Goodwill.
That's some serious luck! Congratulations!
@@NovaluxStereophonic Ya
Damn!
Had mine done by guy in Oregon you no anyone there
I could have got the 9090....I liked the sound of the Marantz 2275 better.
I have a sansui 9090db that need to be repaired can you help me my name is Jerry
You can reach out via my Facebook business profile for more info.
@@NovaluxStereophonic Tv
@@NovaluxStereophonic
What are the procedures for repairing my stereo?
This is Jerry I have a Sansui 9090db I send a message to you about 8 months ago I’m ready to see what we can work out as for getting it restored
Tuve este lindo amplificador 89-2000 tenia una calidad unica hasta ahora me arrepiento averlo vendido ....snif..........
The sound demo makes no justice
Esperaba ancioso mi 10% de la AFP PARA COMPRAR UN EQUIPO ASI...PERO LOS ZANGANOS LLAMADOS POLITICOS DIJERON NÓ AL DINERO DEL PUEBLO..