• 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.

GU50 amp triode mode single end

As 6A3sumser says, connect G3 to the anode and try.
I really don’t understand DIYers commenting on something they haven’t tried.
My C3g-300B SET (now 18040-300B) always has G3 connected to A on the driver.
In my D3a-6C33C as well as in RIAA preamp D3a also has G3 always connected to A.
Simply, because it sounds more comfortable to my ear.
Why is that so, TG said. Same as example from post 8. Triode curves for pentode-in-triodes are better.
Guys, try it. It costs you nothing.
 

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