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Sansui AU-X317 thoughts and recap

GytisB

Member
Good day! So I got my hands on this middle sized Sansui AU-X317 stereo amplifier. Is it just me or there is absolutely no information about it? The only website that has some information is https://audio-database.com/SANSUI/amp/au-alpha317k-e.html . Looks totally the same, but here it says 150w, while mine draws 300w. I feel that 2x55w sounds pretty close to what it can output, while I can still be wrong. My location is in Europe, Norway, so it can be different from the one on the website. Maybe there is some people who know the equivalent of the US version? I would really like to get the service manual for this thing.
I own the Sansui AU-3900 (already restored), and it is just an amazing piece of art. Both sound and looks are perfect for my taste.

I know that alpha series Sansuis don’t get as much love as the older ones from 70s, since the sound is not the same anymore. Hooking it up to my Klipsch RF82 II it sounds somewhere right below the Technics SU8600 and Sansui AU3900. It lacks some life in the music it is producing. This unit is very clean on the inside and caps look fine at the first look. Looking further we see that caps used in this amp are Nippon Chemi Con (main filter caps, and some other), a few Jamicon and a few Taicon. Not to be rude or say that Sansui engineers don’t know what they do, I feel like this unit could get some improvement, especially choosing the better quality caps. I’ve done NAD C272 recap a few weeks ago, and they used exactly the same Jamicon caps. All of them, were dead, showing crazy high resistance/esr or very bad uF reading.

Do you guys think that this unit is worth keeping and restoring? or is it better to sell it and look for other Sansuis. As I said earlier, I love the AU3900. Using it daily for desktop with my Klipsch bookshelfs (RB61 I think). This AU-X317 is going to be used with the other system.

Adding a few pictures of it (disassembled at the moment).
 

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This is the complete list of caps inside my unit:

Power Supply:
8200uF 63V x2 Nippon Chemi-Con Audio (Brown with gold letters, 4 pin)
470uF 63V x2 KME series
470uF 35V x2 Luxon
100uF 35V x2 Elna blue
1uF 100V x1 SME series

Power Amp:
1000uF 6.3V x2 Taicon
470uF 63V x4 KME
220uF 25V x2 SME
220uF 6.3V x1 SM-D Bi-polar
47uF 25V x3 SME
47uF 63V x1 SME
10uF 63V x1 SME
1uF 100V x1 SME
0.47uF 50V x1 Jamicon SK

Tone Control board (Bass, Treble):
47uF 25V x2 Taicon
0.22uF 50V x1 SM-D Bi-polar

Input buttons /front panel:
0.22uF 50V x2 SM-D Bi-polar
100uF 6.3V x1 SME
3.3mF 5.5V x1 SB yellow (Supercapacitor).

Input Board (AUX, CD, Phono, etc):
1000uF 6.3V x2 Taicon
220uF 25V x4 SME
100uF 50V x2 SME
10uF 50V x2 Jamicon SK

Ohm Switch Board:
470uF 25V x1 Taicon
47uF 16V x1 Jamicon

Most of them are Nippon Chemi-Con KME, SME, SM-D. And a few other Jamicon and Taicon. I always did my DIY repairs/recaps using just one type caps, for example "Elna Silmic II" or "Panasonic FC/FR" everywhere. This time I think doing it right. Since I have the boards sorted out, I think going for something like:

Power supply - Panasonic FC/FR or Nichicon HE/PW? + I think of getting CDE 383LX as main filter caps, just with increased capacity, 10000uF. I think it should do fine here. I have a bad experience with UCC SMH series for main filters. Shows much less capacitance than indicated. Some 10k uF SMH series showed as low as 9k uF out of the box. While CDE 383LX was giving great measurments and results.
Power amp - Elna Silmic II and/or Nichicon KZ/FG + Muse bi polar. While I also consider going Panasonic FC/FR or Nichicon HE. Or do these "audio grade" caps really make difference?
Tone Control board - same as power amp
Input buttons/front panel - probably Panasonic FC/FR and a super capacitor thing.
Input Board (AUX, CD..) - same as power amp I guess.
Ohm Switch board - Panasonic FC/FR.

Do you guys think that would be a good choice? I also think of getting a few film caps here and there if I can fit them. Will do the measuring.
But of course, first things first, is it worth on this Sansui? Since I can't get any info on it.
 
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