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In Reply to: Weird tube GM readings on eBay posted by casouza on May 1, 2010 at 20:33:06:
many 6sl7, 7f7's will read this high, particularily Sylvanias if they are new....I cannot say exactly what she is reading...
However I do have a Genuine, calibrated tall bottled Sylvania 6SL7 Bogey tube from the 60's...never used for other than calibration and tester comparisons...it is very informative...
Almost all new 6SL7's are at least 20% high, and most Sylvania are 33% high ::: this is nothing new...this high range Gm gives you longer tube life, and less noise typically.
Sincerely,
-3db
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Follow Ups
- Those Gm readings are not absurdly high.... - Minussss3db 18:08:53 05/02/10 (0)