• 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.

12SN7 Round Plate Tung Sol--is there such a thing?

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Has anyone ever heard of a Tung Sol 12SN7GT round plate? I have three of what I thought were Tung Sol 6SN7 Round plates. Two tested perfect in on the tube tracer--the third looked way too dim in the filament. I turned it up to 12.6V and the filament glowed the same as the 6SN7s, and the tube performed identically. All three tubes appear (and test) NOS.

I have never heard of a Tung Sol 12SSN7. Does anybody know if they exist???
 
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