As I design (sometimes) very high voltage low power(a few hundred of Watts)supplies,and as I previously tested cascode chains of high voltage mosfets to regulate in shunt the high voltage supply of grids up to 5kilovolts,using 12 mosfets rated at 500Volts VDSS,I have two observations,which I submit for further discussion
1)cascode chains seem unstable when they are too long,say above ten stages in cascode.Is there a mathematical criterium which you could propone,for example not single valued string voltage with chaotic tunneling,or something of this sort?
2)I intend to built a 200kilovolt cascode shunt with a 20 Hertz bandwidth(suitable for alpha training of the brain)using 5 x ED500 colour TV triodes,which are rated at 40kilovolt peak anode voltage,40W anode disspation in air,and even more as I intend to use oil cooling and insulation.
Is there anybody interested in this kind of "scientologist" amplifier?
Pr. Birbaumer in Germany succeeded in decoding mind evoked electric fields(TTD:Thought Translation Device;University of Tübingen,Germany)and I intend to build my own 200 kilovolt TTD amplifier.I wonder if anyone is interested,and I need also 5(or more) magnoval sockets for these tubes.T.Y.