Jon wrote...
> Got a question: How hard is it on a tube to have the HV applied to the
> plate w/o the filaments turned on.
It shouldn't hurt the tube(s) at all. This has historically been a
way to have a separate amp on every band. The HV doesn't need to
be switched: you just light the filaments of the band you want to
be on!
>The reason I ask is that unknown to
> me, a relay must have stuck in my power supply control unit and when I
> turned my amp off, the voltage to the HV transformer was never turned
> off. So I thought the amp had been completely shut down and it wasn't.
> I discovered this just prior to the contest on Friday when I went to turn
> everything on and noticed the HV supply cabinet was very warm. Then I
> noticed the HV meter still read 6KV! It was like this for several days.
While the tubes may not be harmed, this sounds like a
potentially harmful condition for the humans who may be around! Fix
it somehow, so that when you turn it off, it's OFF!
73,
George T. Daughters, K6GT
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