Excellent ideas today, guys - thank you very much. I 've got 100 watts + of drive, so I don't believe I'll use a tuned input in this design, instead I'm going to swamp the input to the cathode with 15 1.5k 2W resistors as was successful in the SB230. So the cathode/filament/heater power circuit just needs to look open to the RF but pass the low frequency AC to light it up.
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