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In addition to 12BZ7s, Cary said you can use 12AY7s,and 12AX7s. I got some Mullard 4004s, and they were ok, but a pair of real old GE 12AY7s that my tube dealer recommended were killer, giving the sound more transparancy and life. The 12BZ7s seem to allow the amp to produce more power, but the others are interesting. What other 12AY7s should I try?
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I think 6072's interchange with 12AY7's, don't they? I seem to remember that from ny tube rolling days with my EAR 834P. With my 834P, I got just amazing detail and air with a Pearl Cryovac'd Brimar 6072 in the V3 position, but it was a bit too bright in that app.
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Claud,For what it's worth, I've found that the black plate GE or RCA 12AY7/6072 of the 50's to be the best. Tonewise and long life.
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