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Part of the issue is the massive gain of your preamp

Posted by Chip647 (A) on January 7, 2021 at 18:15:38

In Reply to: Change from single 6922 to twin 6SN7 posted by Todd A. on January 5, 2021 at 14:09:41:

Just some advise.

Your preamp has 30db of gain.

Rather, you need an impedance matching zero gain attenuator.

With this preamp, an input signal of 120mV is amplified to a 2V output (no phono stage) and you will be playing this from a standard digital source (or a stand alone phono preamp). Therefore you will be taking a 2v signal, attenuating it with a potentiometer or resistors to 9mV and then amplifying it back up to 150mV to drive the input of your amp. A full 2v input would result in potentially +30 volts output. This is fine if you have an amp that needs 20v to get to full power, but there are zero commercial amps set up like this.

Before you head down the 6SN7 tube flipping road and end up with some "VT-231 June 1946 SuperTubes With Hand Applied Crome Dome Super Bad Boys Platinum Grade Matched" tubes that the tube merchants push, just try an autoformer volume control (attenuator). You will be really really surprised.

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