|[AMRadio] 813 Triode Connected Bias question.|
ne1s at securespeed.us
Sat Mar 21 10:03:23 EDT 2015
On 3/21/15 5:54 AM, Rob Atkinson wrote:
> On Fri, Mar 20, 2015 at 9:37 PM, Paul Baldock <paul at paulbaldock.com> wrote:
>> I'm think it will be just a few volts for the 813 triode configuration.
>> I could figure the voltage by putting a 1K pot in the center tap and
>> adjusting it for 20mA, (this would allow 20V max). Then when I know the
>> voltage, replace the pot with a zener or string of diodes with parallel
>> - Paul
Appreciate the link to that data sheet, Rob. Saved for future reference.
However, there is no data for use in the triode class B connection, and
that is what Paul is looking for.
In the absence of that data I think his suggested approach of putting a
pot in the cathode lead (center tap of fil. xfmr) to find the correct
operating point and then replace with a Zener (or forward-biased diode
string) of the correct value is a good one, and the one I would probably
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