my scope has the vacuum tube rectifiers - I am pretty sure the CRT is OK because I have gotten it to run for a bit and it makes a fine display. For now, I'm inclined to blame caps - specifically the ones in the grid circuits with the silicon diodes, not the HV ones. I disconnected the grid circuits by removing the diodes, and the HV supply made HV and the current drawn through the oscillator transistor was well under an amp (sorry, I didn't write down the number). There are some orange colored rectangular axial leaded ceramic caps, .015 at 2.5KV. I've ordered some .03 ceramic caps and I just got a bag of .01 ceramic caps, both rated 3KV (so safely more than the original ones). they are quite a bit smaller though - I'm inclined to say that they have newer ceramic with better dielectric but I worry that there is some other parameter that isn't specified that the original caps meet and these don't - I suppose the "easy" thing is to just swap them and try.
I am also thinking that if it is really the HV transformer, a 3KV supply from a Xerox machine is a tiny little module, and 12KV isn't all that big either, so a modern potted replacement might make sense rather than rewinding. but I'll cross that bridge when I come to it.
