• 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.

A mystery device

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Here it is.

It has an additional contact, and a filament is spring loaded, so if it fails cathode-anode is shorted.
 

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