• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Conrad Johnson preamp clone opinions

I see nothing, because of NoScript.

In any event, do you need line stage gain, in the 1st place? How sensitive is your power amp? Given 2 VRMS "standard" digital sources, many power amps are fine without line stage gain. Getting the overall system gain structure right maximizes S/N performance.