• 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.

Differential Shunt Cascode Driver

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Yes, Don, this is the debate we had a couple of years ago. It was resolved by the taking of the curve-traces (sample attached) which demonstrate clearly that the real tube is just as good as the data sheet, for constant voltage use.

As usual, if in doubt, please measure!
 
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