..... much ado about nothing.

Problem appears to have been defective external speakers, rather than a
problem internal to the 5170.

Thanks again,
Dave


"David Corliss" wrote in message
...
Problem is that the 3 amp speaker fuses are blowing, also have poor audio
signal on one channel.

So far have done basic check on power transistors ... checked out okay
but hfe was only 20 or so. They are original parts ... maybe 25 years old.

Checked most of electrolytic caps in power section ... replaced one.

Replaced most, but not all of 'support transistors' in power section ...
was able to get a weak audio signal from one channel. However, raising the
volume level blew a speaker fuse.

The question now is whether to spend $40 on new power output transistors
(total of 4 ... 2SD586). Specifically, could the existing output power
transistors check out okay, with no obvious shorts, but still not produce
the rated signal power level ... and also cause a speaker fuse to blow?

Thanks ... Dave