• 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.

6V6GT

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Hello Nafunga,

Ra depends on anode current and voltage.
You can find a datasheet at "Frank's Electron tube Pages".
General Electric 6V6GTA datasheet:
Find the plate curves for triode operation.
Estimate Ra = du/di at your operating point.
At 150V, 60mA approximately 2000 Ohm,
At 150V, 10mA maybe 3 or 4000 Ohm.

Cheers!
Kees
 
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