Sanyo EZ wave

Typically that's referred to as "HULA". Usually cold solder joint/s and/or a bad B+ regulator transistor.
 
Swapped in the original IC61 and the problem is gone, I had just received the new one from Bob Roberts with the filter cap and never would have guessed it was a problem but I decided to just go back to where it all started and that fixed it.
 
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