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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: Is there a secret to using the 7A4?

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.

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 01/07/17 01/07/17

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