• 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.

Unknown lamps need help

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The one on the far left looks like an 851 triode, obsolete by the mid 1930's, but an excellent audio triode.
You can get 100 watts SE with one of these in class A1.
Plate connection is on the top end.
The other end has three connections: The far 2 are for filament; 11 volts 15.5 amps. The middle connection is for the grid.
Daniel
 
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