[Amps] tube test

[Paul Kraemer <elespe@lisco.com>]

Is there a simple go no go test for tubes like 4-400 and 3-500 using 
only filament power plus a low voltage supply?  I seem to recall 
something that used only a 9v to 12v supply on plate but not sure were 
grid(s) connected to plate or cathode?  Showed if tube was gassy or if 
it might work ok?
Thanks

Paul K0UYA


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