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RE: how calculated?

I looked at the data sheet (Mullard was handy) which has curves for g2 current and for plate current, both for 250v g2. Starting from your operating point of 320v plate to cathode, and assuming 35mA plate current to stay within the maximum dissipation, it looks like you can get 70mA at 50v as one end of the load line; that occurs with -4v of g1 bias. then at 4v g1 and 50v on the plate, the g2 current would be 21-22mA.

This is just the instantaneous peak current; the data sheet also gives quiescent current which is probably close to average current for music. If there is a big enough capacitor at g2, it could supply the peaks, but if it's a regulator at g2 then it has to pass the necessary peak current, at least momentarily.

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