[AMRadio] 813 Triode Connected Bias question.


Paul Baldock paul at paulbaldock.com
Sat Mar 21 18:15:47 EDT 2015


On a sample of 3 tubes, 4 diodes in series (1N4007 about 2.8 volts) 
in the cathode gives my 24-28mA, which is down from about 40mA with no doides.

- Paul

At 07:03 AM 3/21/2015, Larry Szendrei wrote:

>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 use.
>
>73,
>-Larry/NE1S
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