Thread: Changing Preamp and Power Amp Vavles?
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Old 3rd November 2005, 08:29 PM   #14 (permalink)
I_got_a_mohawk
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Quote:
Originally Posted by captain ahab
yeah man, 12au7's i think are about 10% lower gain than 12ax7's. But you know... I ordered a set of JJ's from Bob, and the power tubes weren't the best matched....passable but not the best. HOWEVER, the ECC83 that was balanced for the phase splitter was absolutely perfect...hmmm funny that

Oh yeah, Damage. The V1 position is the place you want to be experimenting with. It is the preamp tube closest to the power tubes and will affect the sound the most. I'm pretty sure I'm right, anyone know any different?
The tubes i got from bob were ace, only pre tubes tho

If i remember correctly, 12AX7 = 100% gain, 12AU7 = ~70%

The V1 tube is the one closest to the input, and furthest from the power tubes in the signal chain, the driver tubes are closest to the power tubes and have least bearing on the sound i think?
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