G Louie:

Thanks very much for your detailed response! It will be a big help as
I diagnose what the problem might be....

I have a Nakamichi 682ZX coming that needs to be refurbished. I'll
wait till it arrives and then I'll have a proper Nak "fix-fest"!

Thanks to everyone who has responded so far...and I'm still looking
for other opinions! Never can get too many!