Another thought - I might need an extra gain stage between the output of the solid state preamp and the phase inverter. I plugged a "pedal" version of the anticipated preamp into a tube power amp and noticed somewhat low volume, as well as noise, showing up as hum on the output. Perhaps some kind of impedance matching is necessary. I will consider this while preparing the amplifier, and hopefully be ready to implement something if necessary.
(0.5HRS)
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