One other component to check is a glass diode on the power amp board.
These would fail fairly often and the symptom was D. C. offset. Chuck



On Tue, 27 Jul 2004 05:27:59 -0500, "Mark D. Zacharias"
wrote:

I'd lean towards coupling capacitors, or the differential pair of pre-amp
type transistors at the amp input stage. A can of freeze - mist might help
narrow it down.
I'm trying to remember - there was a particular type of transistor or two
they had problems with back in those days. I think it was 2SD458, or maybe
2SC1312.

Mark Z.