I have my 20M 813 (2) grounded grid amp working. Trying first without parasitic suppressors. Static plate current is 40 Ma, plate voltage about 2300. Without any driver load or plate output load, the plate current will jump around, up to about 125 ma, as I adjust the plate tune and load variables. I'm assuming parasitic oscillation.
If I attach a 50 ohm load to the output, no changes whatsoever in plate current with tuning. If I remove load and attach a 50 ohm dummy load to input instead, the plate fluctuations are about half as much.
I think I would prefer to not include parasitic suppressors. So my question: Assuming the amp will always have some sort of load, am I good to go?