[Amps] High filament current on the 8877 amplifier tube

["Tim Duffy" <k3lr@k3lr.com>]

Most 8877 tubes that I test draw 11 amps of filament current at 5 volts.

I have tested three recently that draw 15 amps of filament current. All of
these tubes are used and have little "dings".

 

Is 15 amps an indication of a problem tube? Or should I apply HV to the
plate and see what happens?

 

73

Tim K3LR

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