Yea, must beware of the 1000v "wall". I am looking at a copule of transformers that will allow some flexibility as to output voltage. I would like to keep the number of transformers to a minimim. This has to fit on a cake pan after all ![](http://www.audioroundtable.com/emoticons/winkie.gif)
I am going to breadboard with some 1200v fast ss diodes I have on hand and see were that takes me. The damper diode filiments are current hogs and need 6.3v. there do not seem to be many 5v recifers that can take 1000+ PIV, there's GZ37 but a bit spendy
Might be time to try running 6.3v tubes at 5v.Pardon the spelling and grammar, a long few days...John