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Technics SU 8080 Integrated DC Amplifier Restoration

Technics SU 8080 Restoration

  • Can you help?

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  • Can you advise?

    Votes: 2 100.0%

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    2

Ivan T

New Member
Dear AudioKarma Menbers,

I'm new member and I want to apologize in advance for my linguistic and cultural mistakes, if I make any, because English is not my native language
I'm trying to restore my Technics SU 8080 with the help of a technician, but he's only good with doing actual work - disassembly/assembly, soldering, testing, etc. Unfortunately, he's not very good at determining what brand (quality level) replacement parts to use and he doesn't know where to source quality parts. He suggests using new Jamicon capacitors to replace original Matsushita CE series capacitors (light blue with dark blue band and writing). I don' t want to use Jamicons for this amp.
So, I hope some experinced specialists here would help by advising the best replacement capacitors for the original ones, in order to keep the original sound signature - a bit "darkish", very soft, not bright or hissing high frequencies, deep and clean low frequency "foundation", a bit pushed back soft and clean mid frequencies and nice soundstage, that fills the whole room with sound, on certain recordings, instead of keeping sound just between the speakers, like other affordable amps I heard do. Overall, very smooth, soft, "bassy" (in a good way) not fatiguing sound with decent tonal and overall resolution - that's the exact reason a simply love this apparatus.
In need to replace several electrolytic capacitors:
- 470uf 63v - 2 pcs;
- 1000uf 6.3v - 2 pcs;
- 100uf 6.3v - 2 pcs;
- 220uf 6.3v - 2 pcs;
- 1000uf 10v - 2pcs;
And a couple of small transistors, i think, in the pre amp section:
- 2SA794-S
- 2SA722.
For capacitors, I'm looking at modern Panasonic electrolytics, but I'm not sure which series to choose or maybe Elna Cerafines, but I could only find black Cerafines (Chinese made?) ones and a lot of people say that give bright, harsh sound coloration, unlike red (Japanese made) ones. Another thing about capacitors is that some of them have tolerance figures provided in the service manual, while the new ones have 10-20% tolerance figures provided by their respective manufacturers.
For transistors, I'm at a total loss. I can't figure out adequate and preferably not Chinese made replacement ones and where to buy them. NON-CHINESE-MADE replacement parts ARE a priority.
Any advice and/or help is appreciated.

Sincerely,
Ivan Terekhov
 
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Welcome to A.K.
Not so much the caps values but what is available in your country or shipped from another. Are you in the USA?
 
Welcome to A.K.
Not so much the caps values but what is available in your country or shipped from another. Are you in the USA?
Thanks for your reply.
No, unfortunately, I'm not in the USA. I'm in Russia (((. It's impossible to get decent stuff locally, only Chinese, thai, indian and russian made crap.
BUT, I was going to order parts from mouser.com, hificollective.co.uk. I would also appreciate a hint about other web stores carrying original parts and ship worldwide.
 
- 470uf 63v - 2 pcs;
- 1000uf 6.3v - 2 pcs;
- 100uf 6.3v - 2 pcs;
- 220uf 6.3v - 2 pcs;
- 1000uf 10v - 2pcs;
What part of the circuit are these for...? Use 1000µf @ 10vdc for the 1000µf@ 6.3vdc as well.
 
(beat me to it @avionic ) More of a source issue.. can up the v's on the small value caps . Low ESR for the mains caps can up the voltage on those, too. I don't shop so don't know whats available i.e. U.K.
 
(beat me to it @avionic ) More of a source issue.. can up the v's on the small value caps . Low ESR for the mains caps can up the voltage on those, too. I don't shop so don't know whats available i.e. U.K.
And what about the caps' brand? Would Panasonic do or would they make the amp sound worse? If they are ok, which series would be best FC, FR , SU, etc.? Maybe other brand?
 
Only certain caps in certain places in the audio path will alter frequencies or audible sounds. But you're looking for electrolytics.
I don't favor one brand over another. You could probably do them all in Nichicon gold. The 63V 470uf? is that correct? or 4700?
 
Only certain caps in certain places in the audio path will alter frequencies or audible sounds. But you're looking for electrolytics.
I don't favor one brand over another. You could probably do them all in Nichicon gold. The 63V 470uf? is that correct? or 4700?
Yes, 470uf 63v, they were located on the main power amplifier board. May that mean that it's in the signal path, but rather in power supply line?
IMG_20200703_000338965~2.jpg IMG_20200703_000543076~2.jpg
Thanks for advice on Nichicons. How would they affect the sound in places where they can do that? What's their sound signature?
 
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IMG_20200703_002300700~2.jpg IMG_20200703_002404451.jpg IMG_20200703_002604885~2.jpg IMG_20200703_002756262.jpg IMG-20200225-WA0000.jpg
Unfortunately, these are the only parts I have on hand. The technician "lost" the rest of the capacitors and the other transistor.
 

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I don't think you could go wrong with Panasonic FM or FC's
Thanks. I really wanted to hear opinions on Panasonic caps. You think they wouldn't make the amp sound "bright", "thin" and harsh, if used in places where they can affect the sound signature? Because that's the last thing I want to get as a result. It makes old Deep Purple recordings, in particular, and many other classic rock ones sound unbearable to my ears. Does it matter which series to use, depending on what path(place) they are in? I was also looking at FR series, because manufacturer datasheet says that they're made in Malaysia. I'm trying to avoid Chinese-made and alike stuff as much as possible.
 
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