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RE: This might be a dumb question but that's my specialty

If you are thinking that a tube that measures 75% (and 100% is new) has only 75% of the gain of a new tube that is not exactly true. It seems you think that because you reference the 5751 which is about 3/4 of the amplification factor as the 12ax7. The ability of the tube to supply the specified output lies within a range of operating conditions. Therefore when the tube measures in the "good" range, usually around 70% and up it is fully expected to satisfy those conditions. Cheers, Dak


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  • RE: This might be a dumb question but that's my specialty - DAK 15:30:16 01/19/17 (0)

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