Accuphase E202 complete restoration, help needed

[reddish75]

So I've managed to get my hands on another Accuphase E202, which is in a poor state wires disconnected missing transistors on various boards, etc.

I'm going to refurb the boards first starting with the power supply board (719-0004-00). I've got most of the transistor subs from this thread http://audiokarma.org/forums/index....202-troubleshooting-help.477731/#post-6190438, but am wondering on the replacements for the other transistors on this board (which are missing on my board) that aren't mentioned in that thread, namely Q9 which should be a 2sc1382, Q10 2sa682, Q11 2sa776.

Thanks

 

[reddish75]

Ok so I have for Q9, Q10 2sd669/649 which I think are good subs but Q11 any ideas?

 

[RossW]

KSA992 seems to be what people recommend:
http://audiokarma.org/forums/index.php?threads/2sa776-replacement.445315/

 

[reddish75]

KSA992 seems to be what people recommend:
http://audiokarma.org/forums/index.php?threads/2sa776-replacement.445315/

Thanks Ross, forgot about that for the other one I fixed,

Well I've pretty much completed the Psu card, however ive found another schematic (see attached) which is from a later revision of the E-202, it shows that the Psu cards revision number hasn't changed its still on 00 revision but the circuit has changed from the one I have, there's now a 4.7uf bipolar cap across D4, could anyone in the know explain the purpose of this, is it reducing noise?

I'm now turning my attention to the other boards, looking at the filter amp, all of the 2sa776 transistors have corrosion on them, whats best to replace them in this position Ksa992's? Do they need to be matched, in fact are there any matched transistors in this amp?

Thanks

 

[RossW]

Unless the schematic specifically calls for matched transistors it's probably not necessary. Also, if you buy all of the transistors at once from one supplier they will probably be from the same batch and pretty close to matched