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In Reply to: RE: New Production tubes often fall outside factory specs posted by JazzDude on March 27, 2017 at 13:23:57
"I get new production power tubes of a certain brand and type that ranges from 35% to 180% of expected value."
EEP! D:
I know it could be a little off, but that's substantial! I guess it explains all these "high-current" off batches some suppliers have. You can get them cheaper than the average, but you need the bias supply to squeeze down that current.
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.
Follow Ups:
That is not unusual even on old stock tubes. For example I have tested probably near 1000 NOS GE 6550As - a very fine tube - and cathode current varied by as much as 110%. Others would vary a bit more.
That variance is not a big deal at all - and it is NOT unique to current production tubes .
If you like variance look at modern solid state devices. By comparison tubes are close!!
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