[Amps] filament voltage and current

[jeremy-ca]

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 at comcast.net>
To: <amps at 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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