Finally, Sansui G8000 restored

Kale · May 16, 2008

I know that the most members of AK dont like so many words, so my introduction will be short. That G8000 I have bought about one year and half beffore on ebay. I was lucky because at that time, USPS still made shipping by boat, and it was slowly shipping (about three months to Europe) but very cheap (about 80 US$). But when I finally got it, I was mad, look how it was looking:

And it was very dirty:

So first I cleaned it:

After so many searching all over the web, I have found finally potentiometers with click positions, and I replaced all damaged potentiometers:

I replaced all electrolytic capacitors with Nichicon MUSE, Elna, BC Vishy, Rubycon... depends where capacitors are placed.

Replaced two OMRON relays:

Sansui glue:

Driver board:

Power transistor emiter resistors:

Tuner supply:

Main Capacitors:

And finally:

Kale · May 16, 2008

And this is final result:

Regards!

Argyle · May 16, 2008

WOW. You must be very pleased with the outcome. I give you a lot of credit for taking the time to clean and restore this receiver. It looks awesome.

Enjoy!

AU20K · May 16, 2008

WOW indeed! I am jealous now. I need to do some of those things to my G8k.

Job very well done!

:thmbsp::thmbsp:

MAXZ28 · May 16, 2008

WOW...no, DOUBLE WOW!!! Great work - You are a Prince of patience and the Duke of detailing. Your G8K looks awesome! :thmbsp:

I can only imagine it sounding as awesome as it looks! :music:

ZebraBlvd · May 16, 2008

DAMN!! :jawdrop:

Great job :thmbsp:

Kale · May 16, 2008

Thank you guys for nice words about my job.

I always wish to say; do not hurry with job such restoration old receiver, it is much better to replace 10 capacitors per day than damage some board or make some mistake... I can say that I didnt damage neither one board or connection point.

Now I am testing is it all OK, I putted 100kHz sine wave on input, and on speakers output I connected 200 W 8 ohm resistors, and check do it has some oscillations, the scope shows perfect sine wave:thmbsp:. After that I putted 80 Hz sine wave, and kept it on 100 W power per channel for 10 minutes, that test passed OK too. So now, I can say, it is ready for my main setup.

Regards!

ZebraBlvd · May 16, 2008

Kale, wen you get it setup in the main rig take some pictures so we can :drool: just a little more.

Hillman · May 16, 2008

Beautiful Work Z. You have a unit to be proud of for sure. :yes:

noveltone · May 16, 2008

Kale, how did you decide which holco, caddock, etc resistors to put where on the driver boards? I've not seen much on these parts on this forum. Thanks!

Collin

Tucker99 · May 16, 2008

Kale,

EXCELLENT WORK!!

ericson38 · May 16, 2008

I'm glad you posted those shots. I have one, and after looking at your work, have even more respect for it. :thmbsp:

vintaggeman · May 16, 2008

excellent job :thmbsp:
i'm glad to see another g8000 back to business!! :music:

LBPete · May 16, 2008

Very nice Kale. Beautiful workmanship.

- Pete

Morden2004 · May 17, 2008

Excellent job, Kale! :thmbsp: We here in the [Exclusively Sansui] forum are as proud of your accomplishment as if we were the parents of that G-8000! :yes:

Paul

TOM1040 · May 17, 2008

Amazing job. Really. I wish I had the skills for a project such as that. My G-8000 has mostly stock components yet it sounds great.

I commend you on a great job!!

catch 22 · May 17, 2008

You Sir, are a Craftsman in the purest form. That was a labor of love and I'll bet every note sounds all the sweeter. Congratulations on the beautiful restoration of a great receiver, I wish I had your skill and patience.

sauuuuuce · May 17, 2008

I am not only amazed at the job you did on the G8k but I am jealous of how organized your bench is.

Kale · May 17, 2008

Thank you again for all nice words.
BTW, here I wish to show you only one modification what I made in that receiver. You know that at beginning of some restoration, you should decide will you make only restoration or you will make some modifications too. On that receiver, I decided to do only restoration, but one thing, Sansui did on bad way. To correct that Sansui mistake, I have had a big help from another Croatian member ilimzn.
So first about what I am talking here;
There, I am talking about connections of main capacitors. You know that G8000 has 4 pcs of 6800uF capacitors per channel, and that is very good, but Sansui made a mistake how they are connected. First of all, wire of ground is so long! Second, wires of power supply and wires of power stage are connected into one point.

So, we need to separate pair of power supply capacitors from capacitors of power stage, and make better ground wiring.
I did that job on the next way:

and finally:

As you can see pair of power supply capacitors I connected with pair of power stage capacitors by solid wire in Teflon insulation trough ferrite to protect power stage against HF noises.
Once again, thank you so much ilimzn for advices!

I have another on G8000 which has rusty case. On that G8000 I will do restoration AND modifications (high speed diodes in supply, new Sanken transistors in TO3P cases...)

Regards!

Kale · May 17, 2008

sauuuuuce said:
I am not only amazed at the job you did on the G8k but I am jealous of how organized your bench is.

But, my bench is not special, I just think that is sometime small for that job. Here I have one picture how it looks like:

And do I need to tell you, this is my garage

Regards!

Finally, Sansui G8000 restored

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