• 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.

LS60 12AU7 Balanced Pre-Amplifier

I’m collecting parts and designing how to structure organize thing inside the box. Does anyone have experience with this schematic in general? What I can’t find and figure out rate of volume control potentiometer. Is it 50k or not?
Preamplifier is based on schematic in attach.
 

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