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RE: Grid Current

I'm not an expert in SRPP but I don't think so. It may help the output impedance and distortion but it wont provide grid current.
An IT transformer or a mosfet (grid drive) would be better suited for this or run the voltage up a little higher.
With your current driver and voltage, not sure you will get more than a couple watts on a low voltage 845. Those transmitting tubes start pulling grid current early.

You can do better using a 300B and its easier to drive. I would use some DHT's to drive it as well.

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