Tubes Asylum

RE: 307A (VT-225) tube -data sheet link

68.93.65.170

johnmil

In Reply to: RE: 307A (VT-225) tube -data sheet link posted by PeterI on March 21, 2014 at 14:02:13

Realizing this will take a few minutes, I would put my voltmeter
test leads in socket pins 1 and 5. Set the meter for the range
that includes 5VAC and make a systematic search of the first two
knobs (filament). Seems to me you will have found the correct
setting when you see 5VAC on the meter????

Hope this works,
John

Follow Ups:

Yes, good idea. NT - PeterI 06:20:32 03/22/14 (1)
nt
- RE: Yes, good idea. NT - johnmil 06:50:59 03/22/14 (0)
  I checked my 600a and 6000 with a voltmeter. JR is definitely
  the correct setting. I get about 5.9 volts no load.
  
  I've a list of Western Electric tubes and JR is the correct
  setting for virtually every tube.
  
  Not sure what to tell you as I don't have a 539. Perhaps you can
  figure out a way to measure the voltage with tube inserted??
  
  Good luck
  John

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