• 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.

The differential amplifier

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Yves.

I like. A lot!
I would change V1(a) for higher gain (to have more available for feedback)
EF86, EF94 or maybe an ECC83?
 
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