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previous: Dave M. q{I bought 2 Ei 12AX7s and both wer... -- 10/23/1999 3:18 AM View Thread

Re: JJ/Tesla ECC83/12AX7 tubes in PJ?

10/24/1999 7:49 PM
John StokesRe: JJ/Tesla ECC83/12AX7 tubes in PJ?
Lee, microphonics susceptability is a known problem with the Ei 12AX7. I would hazard a guess that most of them are too micorphonic to use in a gain amp. However, not ALL of them are excessively microphonic. I bought a bunch of them from LV that he pre-tested for microphonics, and every one he shipped me is usable. Yeah, I paid him a bit more for this screening, but the result is I got a whole load of tubes and every one is good. When I previously would buy the things, I'd end up with at least a 50% reject rate. So I just decided to pay more and get examples that were known-good. If you are looking for a sweet and warm sounding 12AX7, the Ei is the ticket, if you can get one of the few that doesn't ring like the telephone. Snap them up while you can, I heard the factory was flattened in the NATO bombing of Serbia since the same factory also made tubes used in Serb radars.  

Jeff John, When you say high-gain amps, ... -- 10/24/1999 8:13 PM