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2 more Sansui AU-X1 for restoration

wmac

wmac

AK Subscriber
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Next month, I will receive 2 Sansui AU-X1 for restoration: the first one, the vendor said, is not powering on, and the second, the vendor states that it is smoking. Well, it is going to be a challenge, but I can touch them after the middle of October. I will need to send both of them to Power Coat, but the first one I will have to send to the body shop to repair a big dip in the cover. Some pictures below:


This is the first one
Screenshot 2026-07-23 084742.png

The second



Screenshot 2026-07-21 165411.png
Screenshot 2026-07-21 165706.png

I will start working on the second one that is smoking. I just bought 12 output transistors: 6 PNP and 6 NPN. They are original Sanken.

I will post the issues and the restoration when I start them.
 
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I found those transistors at Dalbani Global; they are in Miami, FL. I don't know if you guys know this company; it's the first time that I am buying from them.
Let me know if somebody has any experience buying from them.

s-l1600 (2).webp

I bought the PNP pair as well.

s-l1600.webp
 
These look different atleast with the fonts I have a spare set from kale for my x1 I will take photos tomorrow
 
quadmatrix82 said:
These look different atleast with the fonts I have a spare set from kale for my x1 I will take photos tomorrow
Click to expand...
Those are not new; they were pulled off an X1. Also, there are some differences. I had one X1 where all the transistors were series N. Please post a picture of yours.
Thank you
 
The "N" are non-magnetic and were maybe JDM only. No measurable performance difference between N and non N. I can share some photos of mine later, too. I have no experience with that seller. I bought mine from Kale and I think he still has some listed for sale.
 
Well, somebody has been in the Amp before. I removed the F-2917, 18, and F-2770, 71. They are easy to remove, and I will start with them.
I said somebody was here because, instead of putting thermal paste in the heatsink, the splash some grease.
Also, another issue is that the transformer's cover has some rust, and I will have to deal with it.

IMG_2962.jpg

IMG_2963.jpg

Forgot to mention the glue.

:wtf:
 
First board is ready: F-2918

IMG_2965.jpg

Capacitors replaced with Rubicon and Elna, Black flags replaced with Murata ceramic COG, transistors cleaned and tested and mica replaced with Silpad

IMG_2964.jpg
 

Sansui Boards F-2917 and F-2918​

Board F-2917​

ComponentOriginalReplacement / Work Performed
Electrolytic capacitorsNichicon generic, 85°CRubycon YXJ series, 105°C
Additional electrolytic capacitorNichicon generic, 85°CELNA RJH series
Black Flag capacitorsOriginal Black Flag capacitorsMurata ceramic C0G/NP0
TransistorsOriginal factory transistorsCleaned, tested, and retained
Transistor insulationOriginal mica insulatorsSil-Pad insulating pads
Trimmer potentiometerOriginal factory trimmerBourns precision trimmer

Board F-2918​

ComponentOriginalReplacement / Work Performed
Electrolytic capacitorsNichicon generic, 85°CRubycon YXJ series, 105°C
Additional electrolytic capacitorNichicon generic, 85°CELNA RJH series
Black Flag capacitorsOriginal Black Flag capacitorsMurata ceramic C0G/NP0
TransistorsOriginal factory transistorsCleaned, tested, and retained
Transistor insulationOriginal mica insulatorsSil-Pad insulating pads
Trimmer potentiometerOriginal factory trimmerBourns precision trimmer
Restoration status: Component replacement and servicing completed on both boards.
 
IMG_2970.jpg

IMG_2971.jpg


Boards F-2770 and F-2771 — Component Replacement Record

The following replacement table applies identically to both boards.

PositionOriginal ComponentReplacement Component
C02Black Flag 20 pFMurata 20 pF C0G/NP0 ceramic
C04Nichicon 4.7 µF / 25 VKEMET 4.7 µF / 100 V
C06Nichicon 4.7 µF / 25 VKEMET 4.7 µF / 100 V
C08Nichicon 47 µF / 50 VRubycon YXF 47 µF / 50 V, 105°C
C09Black Flag 6 pFMurata 6 pF C0G/NP0 ceramic
C12Nichicon 10 µF / 50 VRubycon YXJ 10 µF / 100 V, 105°C
C15Black Flag 30 pFMurata 30 pF C0G/NP0 ceramic
C16Black Flag 30 pFMurata 30 pF C0G/NP0 ceramic
C17Nichicon 330 µF / 50 VNichicon UKW 330 µF / 100 V
C18Nichicon 330 µF / 50 VNichicon UKW 330 µF / 100 V
C21Nichicon 100 µF / 50 VVishay BCcomponents MAL 100 µF / 50 V
C22Nichicon 100 µF / 50 VVishay BCcomponents MAL 100 µF / 50 V
 
I removed the 2 heat sinks with the outputs and the drive board. I did not remove the drive board yet, but I took a picture of the issue, and I believe that the damage is extensive on both boards. Take a look.

IMG_3004.jpg

Both boards have the same issue. I think in the power supply, so I will start to work on the PS first.
 
Board F-2773 muting circuitry board

IMG_3013.jpg

F-2773​

PositionOriginal ComponentReplacement Component
C04Nippon Chemi-Con (NCC) CE04W/SL, 470 µF / 10 VPanasonic FM-A, 470 µF / 25 V, 105°C — EEU-FM1E471LJ
C05Nichicon generic, 220 µF / 16 VKEMET ESL, 220 µF / 35 V, 105°C
C06Nichicon generic, 1,000 µF / 35 VRubycon YXF, 1,000 µF / 50 V, 105°C
C08Nippon Chemi-Con (NCC) SL, 330 µF / 35 VNichicon UPS, 330 µF / 63 V, 105°C
C09Nippon Chemi-Con (NCC) SL, 470 µF / 35 VPanasonic FM, 470 µF / 50 V, 105°C
C10Nippon Chemi-Con (NCC) SL, 330 µF / 35 VNichicon UPS, 330 µF / 63 V, 105°C
 
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