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Original Message
RE: Is there a secret to using the 7A4?
Posted by Tre' on January 7, 2017 at 11:20:06:
With an 80k ohm plate resistor and only 300 volts supply you can't run much more than 2ma. or there will be no voltage left at the plate.
Try a 2.7k ohm cathode resistor or keep your 360 ohm cathode resistor and replace the 80k plate resistor with a 22k.
Tre'