Simple HT supply build

[BusyBee]

My approach has been to use MPSA42 and PHE13009 bipolar transistors in darlington format as a fairly simple series regulator. I have also used similar for active smoothing. In fact the PSU I have just built uses this for the 125V regulation although I have used them for well above that in the past.

I'm not suggesting that it is any better at all and probably beyond the scope of your supply plus also perhaps a bit more complicated but just another possible option.

Tracy