• 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.

Mactone MH-300b schematic or photo

he wanted to modify it. So some resistors are removed from the circuit and they are bought like them, but the modification can also include adding stoppers resistors. It may be a 1 k use for stoppers.
No one here will convince you about the changes. And everyone is looking for the original circuit . But we haven't made any progress yet.