[glyphmon]

Richard,

Thanks for the suggestion.  Unfortunately, there's not much else in this circuit, though one component is the compensator (37) which, in the absence of any other explanation I suppose could be problematic.  I defer to the experience of others if that could cause these wildly fluctuating voltages.

I think the 6Q7 was the culprit on the noise.  I swapped in a different one and the sound went away.  Came back when back to original, so I did try heating the grid cap of the original until it smelled warm, and tried it back in place.  So far, random sound has not reappeared so +1 win for Google and one problem hopefully done with.  Now it's just a matter of figuring out our voltage problem around the 2nd IF transformer.

If I get that squared away, I should be able to even think about doing the alignment I wanted to try at the end of April.

Best wishes,
Roy