Valve Crystal Oscillator Grid Current

[John M0GLN]

I'm with you now regards it being r.f current and probably a different cut of crystal in your test rig Al, now perhaps its my limited understanding of the intricacies of the thermionic valve, but 40mA even if it is r.f still seems a lot to pass through the control grid, for the size of valve used, a 6F6, 40mA of r.f from the anode if it were used as a small output valve would seem to be about correct.

John