• 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.

Western electric VT1 tubes

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Double checked ,It is a VT1 And made by western Electric for the US signal corps and the last pattent date is 1916 .
Second photo is along side a WD12
 

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