Just to reiterate from the original email: Different tubes *WERE* tried
(including two NOS) and loosening/tightening the tube socket & PCB mounting
screws. More work on this tonight.
Meantime, I ordered a new 7-pin, bottom-mount-with-grounding-lugs socket
from Antique Elex and if worse comes to worse I'll just replace the socket.
It is possible that one of the socket pins has actually separated into two
pieces, upper & lower, that lose contact when the tube heats the socket
and the metal expands and changes shape. It's rare, but I have seen it be
fore.
And I'll stick an extender in it tonight and compare voltages top &
bottom.
73/arf,
Paul, K4MSG
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