[AMPS] Misc. Oscillations

[mike@g0mjw.freeserve.co.uk (G0MJW)]

> While running proper voltage is a good idea, the number of tubes
> that fail in amateur service from loss of filament emission is
> extremely low. The largest failure mode by far is gas ingress or
> poor welds.

With the exception of the 2C39A that is generally over run in amateur
service. I have measured many 4CX250 industrial pulls and they were nearly
all low emission. They still worked well enough. The lower gain helped
reduce parasitics.

Mike


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