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On Fri, 6 Apr 2018 09:26:18 -0700, N6FFC wrote:
>have a Question about
>?Warming-up? the Tube!
REPLY:
All transmitting tubes should be warmed up before drawing plate
current. It's OK to apply plate voltage immediately, but be sure they
are biased to cutoff during warmup. Zero plate current until warmup is
complete, otherwise the cathode can be damaged.
Consult the manufacturer's data sheet for warmup time. It varies
greatly between tube types.
Small receiving type tubes apparently are exempt from this requirement
or at least I have never seen such a requirement published.
73, Bill W6WRT
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