DIY Audio Projects Forum

Sansui QRX3500 No power
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Author:  wireliner [ 20 Feb 2015, 18:09 ]
Post subject:  Sansui QRX3500 No power

I would really like to fix this amp ive had it since 1973 I blew a fuse and replaced it when i turned it back on it made a humming and lost power fuse didnt blow was supposed to be a 4 amp but couldnt get any and used a 5 what could i have blown up in it thanks I love this amp would like to revive it

Author:  turk 182 [ 21 Feb 2015, 23:13 ]
Post subject:  Re: Sansui QRX3500 No power

output transistors; diodes in the supply; filter caps and potentially any combination of the three!! :eek:
fuse ratings are not to be taken lightly or ignored, they're in there for a reason! :eek:
before going any further in diagnosing or attempting to service your amp assemble a "dim bulb tester"(there's a thread in this forum about it and it's use. sorry can remember off the top where it located)
what sort of test equipment do you have at your disposal?

Author:  Geek [ 22 Feb 2015, 02:20 ]
Post subject:  Re: Sansui QRX3500 No power

An amp that old needs a recap, plain and simple.

Use standard diagnostics for the rest of the stages (a DMM on diode test will be invaluable for the transistors and diodes).

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