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TV-7 Question

Walter R

Walter R

Active Member
Can anyone explain to me how the two filament selector switches are wired on a TV-7 tube tester? I want to test some Chinese 6N3 tubes which have the filament on pins 1 and 9, which is unusual for a US tube. The other selector switches are clear, but I’m not sure how to get the filament voltage to pins 1 and 9.
 
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