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#1
03-09-2016, 09:54 PM
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You could use an AC voltmeter to hunt down where you lose voltage along the heater string. This means you'd have to work on it hot. Start at the 19T8 and keep going until you find a tube with 0V on one heater pin and 120V on the other pin. That's the tube with the bad heater. It could be a dirty socket, try wiggling the tubes.
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#2
03-09-2016, 10:30 PM
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Or simply pull the tubes and ohm out the heater pins... look up the base diagram on line if you don't have a tube manual. Most 7 pin tubes use pins 3&4 for heaters and many 9 pin tubes use pins 4&5, but there are exceptions. Be sure to clean/deox the pins and sockets if you haven't already.
jr
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