When the tube is cathode driven the limit of the input signal voltage cant
exceed the specified limit.
Not a worry when excessive drive isnt applied.
Carl
KM1H
----- Original Message -----
From: <kg7hf@comcast.net>
To: <amps@contesting.com>
Sent: Friday, April 11, 2008 1:08 PM
Subject: [Amps] filament voltage and current
> Lots of good topics today.
>
> Speaking of heater voltage. I am working on my first tube based
> amplifier.
>
> Is there any reason that an adjustable voltage regulator couldn't be used
> to "dial in" the heater voltage? I'm specifically thinking about his
> for a single 3cx800a7 which requires 13.5 +- 0.6v @ 1.5A. One thing
> that bothers me in the 3cx800's data sheet though is the cathode-heater
> potential (it lists +-150v). I don't know what that parameter is and I
> don't see it listed in other datasheets.
>
> Thanks,
> Paul, kg7hf
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