Valve Crystal Oscillator Grid Current

[pwdrive]

I'm still a bit puzzled, presumably if there is 40 ma flowing through the crystal then that same current must be flowing via the grid of the valve as the valve is the only thing that completes the circuit that the current can flow through ignoring the reactance of the shunt capacitance and the value of the grid resistor which will both be be high in relative terms.
As John originally said it seems a lot.

Lawrence.