• 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.

6v6. 6lg Gain Max Voltage

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You don't usually use the term "gain" with power tubes - it make sense with voltage amplifiers, where it's the ratio of voltage out / voltage in.

The tube data sheet will give the grid signal required for a certain power out - find 'em here

6V6 is usually operated at 300V or below for class A - at 40 mA it is right at its dissipation limit of 12W. 6L6 can be operated up to 360V at about 55 mA (19W limit) - the 6L6GC can go higher, but it's better suited for AB operation.
 
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