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RE: Aikido with D3a??

Posted by Chip647 on March 10, 2017 at 19:50:33:
That tube has an amplification factor of 77. How much gain are you needing?

150V on the plate and 20mA would not be a bad point. 8 tubes at 20mA will cause you to have a very stout +200mA B+ supply. a 320v B+ would work.

Use the recommended cathode resistor of 470 to generate the 10 v of bias for around 20mA at 150-160 volts across each tube