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Perhaps *really* clean the tube socket pins well. Can you prop the chassis up slightly and try to measure the voltage at the bottom of the socket? * Is it a wired or printed circuit connection from the tube base to the source of heater voltage? I assume that you are indeed counting the pins correctly and the correct tube is installed.
jr
edit add:
* perhaps tack solder a couple of wires to the socket, and bring out for measurement?
Last edited by jr_tech; 09-05-2014 at 05:19 PM.
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