AU-9900 - Maybe The Best Ever! Sansui Integrated Amplifier Vintage Stereo Repair Audio Restoration
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- Опубликовано: 19 фев 2020
- Sansui AU-9900 stereo integrated amplifier video showing the repair and restoration of this vintage classic audio equipment that was produced from 1975-1977. It has the reputation of being one of the best sounding vintage integrated amplifiers ever produced. I detail the complete restoration and repair process from the power amplifier section to the faceplate and knobs. I then show the procedure to check the bias current of the output transistors as well checking the DC offset.
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Развлечения
Beautiful Machine,!!
I have been into vintage audio since the days of quadraphonic equipment as a young teen at 14 or 15. I'm now 62 & really enjoy watching you work on and rebuild this equipment. I really appreciate your patience & expertise. Thanks. I had a Sansui 50/50 receiver & a Marantz 22/25 receiver at one time. Now i have a vintage Technics SA - 52/50 receiver I'm using as an amplifier , because the FM quit working.
This is why I love and appreciate the Yamaha s-integrated. Nothing but quality , a throwback to yesteryear
You have to admire the producers of the Sansui. They really built a musical ' tank' !
Sansui made top notch gear back in the day. Thanks for watching.
I don't have one of these amps and probably never will, but I did watch all four of your previous AU-9900 videos. To me it is interesting to learn the methods and techniques used by different RUclips vintage restorers. As you say, there is no "one right way" to do this work, but your experience and attitude make your videos quite instructive and satisfying to watch. Your explanations are clear and effective. I hope you had opportunities in your life to teach others, because you're good at it.
I'm a retired EE with a life-long interest in audio, DIY and otherwise. Its interesting to see the different design and construction methods used by manufacturers of that era, and I've learned many useful tips from you and the other restorers.
Couple of specific comments, not criticisms. About contact cleaning and DeOxit: you've mentioned cycling the switch or control dozens of times to ensure thorough cleaning and treatment of the contact surfaces, which makes sense. Mr. Carlson's Lab suggests a first application of the contact cleaner, waiting about a day, then a second application. This makes sense, too: the first application cleans and lubricates the contacts, and gives the cleaner a chance to treat the contact surfaces. The second application helps to flush away loosened debris. Just another option. A minor point: it is painful to watch some less-experienced restorers blast DeOxit over half of the PCB and the inside of the chassis; I'm glad you don't do that. DeOxit is good but expensive; that kind of sloppy application is wasteful and makes an unnecessary mess.
Another option for connector contacts is a product called Nyogel. This is a grease, not a liquid. Nyogel is specifically designed to prevent, among other things, a type of contact corrosion called fretting. Fretting happens when microscopic movement between the contact surfaces occurs because of normal temperature cycling at the connector, when the equipment heats up and cools down. This movement isn't enough to scrape the surface clean, so eventually invisible, microscopic corrosion sites build up on the connector surface. This is one reason that sometimes re-seating a connector fixes an intermittent fault. But once the connector gets to that point, the fault will return, sooner or later. Nyogel is quite effective at preventing and fixing that problem. It's expensive, but so is DeOxit.
And now about electrolytic capacitors: you are, of course, right that those caps have a finite life and should be replaced. My career work was designing and manufacturing embedded controls for high-quality, high-reliability (read: expensive) commercial equipment in harsh environments, and electrolytic caps need careful selection and testing. My picky nit is that you really beat the capacitor issue to death in a lot of your videos. I understand that not everyone will watch all of your videos, and it is good to mention it, but really, if someone doesn't get it or doesn't agree by now, they're not going to. If I recall, you made a dedicated video addressing just this topic, so maybe a mention and a link? Your videos, your decision, and it is a minor point.
At any rate, great videos. I'll keep watching, and I appreciate the time and effort you put into making them. Thanks!
Thank you for watching and thank you so much for taking the time to comment. I appreciate your suggestions and for sharing your experience.
Sansui 907 series from 1987 onwards were the best integrated amps, but mostly sold only in Japan.
Oh, wow! My high school had one of these circa 1980 and I haven't seen one since. I loved the feel of the controls.
Yes, the old audio gear controls have a nice solid feel to them.
My Dad bought a Sansui in Japan in 77-79. It was awesome until it started a small fire in 99.
I'd had many units fail for one reason or the other but I've never had one start a fire. Hopefully I never will.
*WOW, YOU ARE THE WIZARD!! THANKS FOR SHARING YOUR KNOWLEDGE, WE APPRECIATE IT MORE THAN YOU KNOW.* *DON'T KNOW ANYTHING ABOUT ELECTRONICS, BUT HAVE ALWAYS BEEN INTERESTED IN FIXING THINGS, JUST NOT ELECTRONICS...THANKS AGAIN!*
It's a real nice unit to run Black Friday through
Yes, it is.
I just fixed a AU-11000A, its almost the same thing, the 11000 has gold plated terminals on the inside along with a larger power/protect board. the main caps are 10000uf as well. those fragile transistors on the driver board are not present on the 11000A .
This amp is a work of art, the cover over the driver board is just for looks and just for the service guy.
Great video, well presented, informative.
I watched all 4 parts, good stuff, thanks.
Oh Man. thank's so much! Here on RUclips it's very hard to follow a series from a creator unless you make an effort. Everyone just has so many choices in their feeds. Thank You!
I HAD ONE BACK IN 1999 , STATION IN. AUGSBURG GERMANY , MAN I LOVE IT.
Very cool! This equipment brings back a lot of memories for many of us.
Very Nice video, it's pleasure to watch. Thank you!!!
I have this guy and love it... thanks for sharing
Your welcome and thanks for watching.
That is an awesome an awesome amp i wish to own. I have the au-1100 which i love so much. A keeper, awesome amp. And that one is the topnof the chain. Wow!
Fantastic job. Thank you.
Thank you too!
Love your link list above in your description. Man, I thought I had the vintage audio bug, but you got me beat. New subscriber, vintage collector, retired electronics and wire harness assembler. Just getting my workbench setup in my house to keep this stuff alive.
Awesome, thank you! My other half calls it an illness but what does she know, LOL. It's a great hobby! Thanks again.
@@vintageaudioaddict Not only do I have a lot of audio gear, lots of things I have heard, played with and sold, I have audiophile friends that we loan each other things to try out, give back, trade. I am lucky enough to have a couple of hifi stores where we get together to audition used and new gear and recordings, meet people in the industry, talk to the engineers. My buddy has the AU-9900 which I have worked on for him, plus he has two TU-9900 tuners. I bought my Nakamichi Dragon from him. I put my first video up of part of my collection starting with 3 JVC hifi VCR's with a link below that to ffw to the tape deck collection. You must see the museum quality Pioneer CT-F1250 cassette deck I have waiting for repair. Still has the decals on it. Love this hobby. Can you remember the first gear you heard when you knew you were hooked? I can.....
@@vintageaudioaddict People have told me that most people have pictures of the pets and kids, I have pictures of audio gear I have had.
Man, wish I had your skills as I'm 54 and getting back into audio. Going to learn to solder. Your videos are very helpful. Thanks
Do you suppose there's some kind of half-arsed short cut voodoo I can do to transfer his electrical knowledge? Wish there was. No, it only comes with experience and skill.
Your welcome and thank you very much. Really, it's not that difficult. I think most people will tell you that experience is the best teacher with this stuff. Kind of like most things in life. Get a junker piece of equipment to learn on and get that soldering iron hot!
Sansui very good amplifier and Your work very professional
Thank you very much for watching and for your kind words.
Wow I like your video very much! Very instructive and interesting! I've got a Mediator (Philips) hifi sound project ta 12000 that I received a few years ago from my father and a friend of mine made the maintenance. I love this "vintage sound"!
Maravilloso vídeo, te mandaria el mío para restaurar sin dudarlo!!
Making it look easy! Dang man i have spent 30 hours cleaning the G-8000 !! I wanna restore the caps but it sounds perfectly good it set in a closet for 35 years !! It was for got about !
Wow, 30 hours cleaning! My other half will be inviting you over, LOL. This stuff is mostly about experience, it's really not that difficult. Unlike today's electronic's the vintage audio equipment was engineered so it could be repaired. It's great that you got your G-8000 going again, she's a good one!
@@vintageaudioaddict I love it ! Just had alot of build up on it i wanted it like new again , but a lil scared to replace caps , i saw all the brown glue , and i disconnected all circuit boards and cleaned the contacts some were lose of course 😆
It is clear for me that you do all that work with love. Just a side note, I have never seen final transistors socketed and not soldered, in a factory equipment. Sansui guys must have been very confident in their solution. By the way, some 45 years ago I made my first diy amp and I used old noval tube sockets for the power transistors, with a good reason at that time: I just kept swapping the Ge power transistors and it was easy that way 😉
Yes, I enjoy it. It takes time but work doesn't have to be hard if you like what your doing. Yes, anything in a socket does make replacement easier. I have never built my own amplifier. I don't have the skill set but I do have a couple Dynaco amps that were Dynakits that someone before me put together. Much of the vintage audio equipment that I have in my collection has their output transistors in sockets. Many different brands, McIntosh's, Pioneer's, Sansui's, Marantz's SAE's etc. I do recall that my Marantz 2500's does have it's output transistors soldered in.
Love your passion buddy !!
Thanks, I appreciate that! I see you in here commenting and I appreciate that also.
Nice piece
Thank you! Cheers!
What a cool video!!!!!!
Ein Geduldiger Kind.....Ohne Hasse & Böses Denkungen......
It has more metal in than my car. I love the modular design, pretty rare to see that type of separation today.
The vintage electronics were engineered in a manner to be repaired when they broke. Most of the modern electronics are engineered to wait for trash day.
I love sansui
I watched all four parts of the other Sansui amp rebuild. I find you incredibly slow, intentionally scrupulous, painstakingly careful, and those are the best qualities of a good teacher. After watching those and other videos of yours i feel confident that i can replace caps in my old units. I have an old Realistic Navaho Base Station CB radio, an old Pioneer SA 1080, and a Onkyo amp to rebuild. Im looking at capacitor prices and where to order them. I got this except for the cool expensive pro-test equipment you have, but i'll just play music loud to test it.
Thank you very much! These restorations do take some time. I'm sure that you will do fine with restoring your equipment.
Perfect👌
Thanks
I watch all your videos now matter how long or split up they are.
Thanks, I appreciate that.
I have the Sansui AU-20000, which is kind of like this, but adds analog power output meters. I don't know if the spec is anywhere close to the AU-9900. Sadly there is no loudness control, which is kind of odd for a full featured integrated amp. I believe it is 170 WRMS / Channel. If I recall, the damping factor is amazing.
Interesting the tuner which came with it is TU-9900, which would theoretically be the model to match the AU-9900 amplifier. The tuner has amazing FM DX performance!!
I'd love to have an AU-20000 in my collection. Congratulations on owning one.
Hi, about the 14 minutes I noticed some grooves on the board, interrupting the trail. That's normal?
Inspiring job! Thanks for sharing.
My best audio chum had one of these snd they were quiet, and great looking.
However....several friends had the latter day AU-717 to 919 series and the blew output transistors easily.
Thanks for sharing. I don't have any experience with the AU-717 or AU-919 but the Sansui's in my collection have been pretty reliable.
Ever looked inside the Sansui AU 20000 from the same series? 170 W/ch which was the highest power ever offered in an integrated amp in the 70s. Check also the Sansui AU 919. Technically it may be the best period... five power supplies, fastest slew rate / rise time and lowest TIM distortion of any amp at the time. Possibly surpassed by the Harman Kardon Citation XX power amp which was release three years later.
I actually did watch all of the videos on this. Why? Because I love my Sansui AU-717 amp & tuner. I found a service tech. in Oregon who went through the amp and just yesterday picked up my re-capped Bozak crossover networks from a place I found in Salt Lake City. They are for the B-4000 Symphony model of 1969. Living in Idaho Falls, Idaho, nothing happens close to my house. I just subscribed after watching a few of your videos. I find your videos very to be very informative and I appreciate your patient thorough approach. I'd like to see you go through an old Technics turntable. At one time these were common as rocks but I'm not confident enough to attempt dis-assembly on my own. (disconnected tonearm lead) I shall stay tuned in for any and all of your videos. Thanks again, Sir.
Your welcome. Thanks so much for watching and welcome to the channel. You have some great gear and I'm glad that you found someone to service your equipment. That's getting tough to do. I appreciate your feedback on my video's and your suggestion to do a turntable.
Sansui uma marca q resiste ao tem..🤗Eu mesmo tenho 2 sansui q tem mais de 38 anos e toca perfeitamente..👏👏🇧🇷
I was used in 1974 till 82 good power amplifier make for little party, like home diskotik
Thanks for sharing and for watching.
Loved watching this and was impressed at how modular it was. Really makes it nice to work on. Did you ever work on a CA-3000 Sansui preamp? I had one and those pass-through connectors on the boards were a nightmare for my repair tech to re-do.
Thanks for watching. No, I've never had a CA-3000 in my collection or seen the insides of one but I do have a CA-2000 that I restored. Some of the units can be more of a challenge then other's to work on.
I'm restoring a non-working Sansui AU-9900 and I've noticed a lot of differences in the components used.
Nice vid,,,
Thanks Doc!
Suggestion... Hey my friend would you consider doing a video on reconditioning a vintage turntable........??? The first reason is personal... After watching a few videos on RUclips on turntable repair feel this would be a good spot for me to start and learning how to repair vintage equipment... They seem to be a lot simpler a lot last caps replace excetera... plus I have 2 thoren's turntables, a Harman Kardon t55c turntable still in the box AKA NOS.... and I also have a direct drive Sony PS x70 fully automatic oh... It does everything but hold your hand LOL. But it's a beast and it weighs 35 lb... Again thank you sir for taking the time to read my long post... I've just been perusing the RUclips channel and if not found much that would help me when it comes to turntable reconditioning... thanks in advance for reading and looking forward to your response...
Hi Chris,
I have recently acquired a Sansui AU9900 and have watched your video, pt1 to pt4, on RUclips. It was great and I enjoyed every bit of it.
My AU9900, besides requiring a full recap (more than 45 yrs of age), has a popping sound on the left channel after the amp is turned on for about 4-5 mins when it starts to warm up. Do you have any advice for me in this instance?
My plan is to first recap the amp completely first, adjust the bias currents, etc, to see if this goes away. As such, I would like to ask if you have a list of the required capacitors that I can order from your last restoration exercise. If you do, that would save me some time by not having to remove a board, check the caps, place order, wait for a few days for these to arrive, and keep repeating that for a number of times.
On the other hand, I think to recall you said you would change the 4 big reservoir filter capacitors in your amp, but don’t recall you showed the details of such. Did you end up changing those? Please advise.
Thanks you very much for the excellent videos.
Looking forward to hearing from you.
Regards,
Jeremy
from down under
Hi, great video, thx, but what about the Filter caps replacement, any tips, I´ve got a faulty one.
in the 90's I use to perv over having 1 of the newer Sansui's AU series
The last of the best that was Sansui & at least they went modular
She's built well.
I really appreciate this as I was given one from a neighbour to work on and it’s my first stereo amp. I was just curious about a couple things, first the right speaker does not work at all (through headphones either) and also the bass is very distorted. If you could give me some insight I’d really appreciate it!
It's really difficult to say what the issue is other then the equipment is pretty old and probably needs a restoration. Almost all the vintage audio gear needs attention being 40+ years old. Electrolytic capacitors are the number one cause of failure in any type of older electronics.
Don't forget to replace the filtercaps in the speaker wires too😱
Wünsche ich es Euch alles Families Gesundheit & am Arbeitsplatz mit guten Klimaschutz haben......
Do you have a soldering video that I have missed? If not, would you consider putting one out, that shows what temperatures you use to solder with your Hakko unit? And the more in depth techniques that you employ? Thanks!
I have a Sansui AU 11000a which I think is a step up from the 9900. Always had to turn up the volume knob to 11 to get a sound from the 11000a. I prefer the sonics of the older model 9500 and the 777, Just sounds better to my ears. More bottom end. The phono stage especially
Thanks for sharing. Sansui made so many great audio products over the years. You said the correct thing.... "Just sounds better to my ears." So many people don't listen to their own ears. They need an "expert" that "has special ears" tell them what's good and what isn't. Listen to YOUR ears, no one else's.
They days when Sansui were built like tanks and easy to take apart and service. If electronics was this straight forward to day.
Its was sad to see Sansui take a dive in quality when they started making the fascias out of plastic.
The back panel became hardboard and the power amp became one large scale IC.
Yes, the older equipment was built to last and it has.
I really enjoy your restoration videos. You are very good at what you do. Did you use to do this for a living or are you just self taught? Also, I admire your incredible collection of gear. I never hear you talk about your speakers. What are your favorite speakers that you use to listen to all this great gear?
Thank you very much for your kind words. No, this is just a hobby and yes I was self taught but I have an electronics background. I started to collect speakers when I got into collecting the electronics but I soon found out space was going to be an issue collecting speakers. I usually use my Definitive Technology STS speakers which is a modern speaker. They are an easy load for my small tube amps but have no issues with higher power solid state amps. They are also compact by vintage standards and of coarse I like the way they sound also.
@@vintageaudioaddict Thanks for your reply. I agree about the speakers taking up a lot of space. I'm going to have to reduce my speaker collection some in the near future.
Have you ever made a comparison recording between before and after recap an amplifier and see how big the differences is? It seems tha this Sansui was already working before, so I would be nice to see what to expect after recapping a unit. In my case I have a small restoration of my Sansui A40 but it was limited to potentiometers and switch selector cleaning. The unit is working fine, sonI am in doubt if I should change all capacitors. Thank you
The main reason that I recap is for the reliability of the unit. As for the sound it doesn't really matter what "I hear", it's what you hear. I could tell you this and then tell you that like so many of the audio forums do. Panasonic caps are better, no you are crazy Nichicon is the best. On and on folks argue. My other half loves the way her Sounddesign electronics and distortion lab speakers sound, is she wrong?
Check out the video below and see what the manufacturers of electrolytic capacitors say about their own products.
Replacing Old Electrolytic Capacitors - ruclips.net/video/RaWrYJ6amcA/видео.html
My passion
Love this video and look forward to a total recap of a AU-9900 that I got yesterday.
Did you replace all the caps but the 4 large ones? Looks like the are not worked on in the video …
Thanks for watching. I did replace them after I completed this video. I had to order them. I have most all of the other components I need in stock when I begin a project. About the only one's I don't have are the filter capacitors.
@@vintageaudioaddict thanks for the answer. Any recommendations for these caps? I may go with Kemet 10000uf/63v since they will fit :)
Thanks for posting this video. I recently acquired an AU-9900 and it the sound quality really surprised me after getting it resurrected. I was going to enjoy it as is, but after watching some of your videos I’m going to be weary of a capacitor failing and doing damage on its way out. Where do you source and buy your replacements parts?
Your welcome and thanks for watching. I've listed a couple of video's below that may help answer your questions about parts.
Here's a video I did on parts sourcing - ruclips.net/video/todxFu1c0H0/видео.html
Here's a video I did on electrolytic capacitors - ruclips.net/video/RaWrYJ6amcA/видео.html
Vintage Audio Addict
I will check both of those out. Thanks!
You need to replace the junk trim pots also
Great series, I watched all four episodes. I have two questions about the bi polar capacitors. Do they have a orientation or polarity? One leg seems longer than the other, is that how you determine its polarity?
Thank you so much for your kind words and for watching. Bi-Polar's have no polarity so you can install them either way. The electrolytic capacitors will have a - sign on the negative lead and that is normally the shorter leg but always look for that - sign to be sure.
Hi sir i am from India.
I have learnt many things and qualities from you.
Thanks alot Teacher.
Not sure about best looking, But I believe it is the best sounding.
She does sound good!
I have sansui au 7900 worth restoring, it will improve the sound
What's with all the cut traces and soldered wires on the "F2580 Driver Assembly" board. What are the modifications.
I've got a fully restored AU-9900 and have heard and read that there is a difference in how the volume is controlled between the 9900 and the 9900a. Could you explain the difference and give me an idea of how this correlates to the volume indicator. In other words, do you need to turn the 9900's volume level up further than the 9900a's to get the same level?
Very nice, what do you think about the Sansui AU-717 in comparison to this 9900 ?
Thanks. They are both really good.
How is the 999 model I just found one today in mint condition
where to buy supply's (capacitors, etc.)
what happened to the BA 5000 Vid, and I never got to see the 2205 video, will they come back?
What about the large electrolytics in the power supply? I've seen a few similar videos where these are not replaced like the others. Any reason for that?
Boa tarde esse amplificador sansui está a venda ?
Hello. When you put your thermal compound on, is it under the mica piece or between the mica piece and transistor? Do you just spread on a thin layer? Also....you helped me successfully replace some leaking and faulty caps on a project unrelated to amps. Thanks. A.
Great! I'm glad that you got your unit operating. You put a thin layer of thermal compound on both sides of the mica insulator. Both the heatsink side and the transistor side. Yes, a very thin layer. You are just filling in those microscopic imperfections in the metal of both the heatsink and the transistor so the heat transfer is better.
Ssnsúí e otimo
😍😍😍😍😍
hi... i had the au9900A can you help me? i need to buy the capacitors... the big ones... 6800uf 63v they are screw terminals?
16:04 IF it has a capacitor mounted on the ground plane, and a thin track, you pull FIRST the leg from the thin track FIRST ALWAYS, never do the leg on ground wide plane first, because pulling it first, you can lever and unglue the small thin track on the opposite size.
I have an AU 9900 with a problem. It is switching on an of by it selves . Any idea what may be the cause ?😊
Vielen Dank für die Menschlichkeit Bemühen......
I have this but needs fuses. Got for 15.00 at goodwill
This is off the subject. I have an NAD 6300 cassette deck. Where do I get the good belts. Your recommendation is the one that matters. Not interested in eBay. Not exactly trustworthy. Look forward to your take on this. Not wanting to buy a bunch of unwanted or unneeded sizes. This is the only deck I have!
do you use a series lamp and a virac
I do use a dim bulb tester and variac.
Does this amp have Darlington outputs?
Yes, this AU-9900 features a 3 stage Darlington power amplifier.
How would you, or any audiophiles, rate the AU-417? I have one, but really don't need it. Thinking of selling it. I prefer to use my Pioneer quadraphonic amplifier. Pink Floyd sounds incredible when I fire her up! I've got Altec Lansing speakers that sound awesome also.... All OLD SCHOOL!
Your Sansui is a fine small integrated amplifier. You should have no problem selling it.
A 7900 ain’t to bad either!
No, it isn't. Sansui made a lot of outstanding equipment.
Hello. What do you think of the AU 9500. Thanks
I think it's a fine integrated amplifier. Sansui made many really good products back in the day.
@@vintageaudioaddict gracias
👍👍😎✌️🤟
You just need to find the holy grail above all, the Technics SE-A1 Power amp anf the (unobtainable and may be your biggest challenge..) the Technics SU-A2 Preamp, find and restore those and you are done., for lufe.
Thanks for sharing your thoughts. Yes, I 'd love to find those units. Technics made some great audio equipment. I have a SE-9600P in my collection. She's in terrible cosmetic shape but I like her just the same.
For a sale ?
Wünsche ich es Euch alles Jungends & Erwachsenen sehen.....Wie ist der Aufwands......Wegen Kinder Geburtschein haben.....
For sale ?
♥️💘💝👍💝💘♥️
Thanks a lot for watching.
bläg! öh nö silver büttönie xD
Sanßui 9000
Can't I no the price
I don't sell equipment. I'm strictly a collector.
Beautiful amp. Too bad today’s gear is all black box, boring clone crap.
Thank You!