+Nate Caine
Continuing discussion here......

One open question in my mind is the tubes current regulation. It has been suggested that these supplies regulate the tubes current.

Its clear that the feedback circuit measures the current in the flyback primary and that adjusts the PWM. However I don't think that it really measures the actual current in the tube, unless there is some reflected effect from secondary to primary that I do not understand.

It seems to me that the current in the primary is a proxy for the current in the tube but not the real current, especially since the tube starts out as a high impedance and then goes negative resistance.

Also I do not know if you have seen this post regarding my attempts to see what is in the flyback.

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