Thanks Carl, that makes sense now. For some reason I was thinking it was some
sort of induced voltage between the heater and cathode. I didn't think my
little L200 regulator could handle that too well.
I think I have about a million pounds of parts. Now all I have to do is get
over my fear of the unknown and just do it.
Thanks again,
Paul
-------------- Original message --------------
From: "jeremy-ca" <km1h@jeremy.mv.com>
> 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:
> To:
> 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
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
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