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defective sansui AU-7900.. should I buy it?

I replaced the VD1212, now the relay circuit works fine.

I also got rid of the pesky fuse resistors, I measured them and they were all out of spec: 2 of them read about 550 ohm, the others were in the 300 ohm range.

I've still a minor problem: when connected to the main AC there's some buzz on both channels which goes away if I put the amp on the tone & filter position. Other positions are buzzy. This doesn't happen when I power it via a dim light bulb tester. Could be the AC socket? I have not tried another socket yet, this thing is damn heavy to move around ;-)

Thanks everybody for the help!
 
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