"Anatoly" wrote in message
...
I'll look over the schem when I get a chance - but I have seen bad
eyelets at the power transformer boards on Pioneers, a bad eyelet at the
center tap would let the ground "float" and could cause your problem.

Mark Z.

Mark,

Thanks for the reply. I did check the center tap wiring it is OK. The
ground is not floating relative to power supply rails -- both high and low
voltage rails stable and correct. The power stage ground is offset
relative to the amplifier signal ground. It is a kind of weird "floating"
ground power stage power supply scheme.

If you have scheme in electronic form, could you please send it to
(remove at@ and dot.)?

Thanks,
Anatoly


The grounds dhould be the same - look closer at the eyelet of the little PC
board where it connects to the center tap pin of the power transformer. Try
resoldering the eyelets. One might curl up as soon as you heat it up and
apply solder.

Seen it more than once on Pioneers.

I'll send that PDF.

Mark Z.