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Originally Posted by merlinmaxwell
Watch out for heater cathode insulation
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I'm a bit concern about that, even with the diode used in the original circuit. It has one cathode to earth and the other to a voltage near HT+, and the heater is the same for both of them. In the datasheets it is stated the max voltage between cathode and heater is 330V for EB91 and 350V for 6X2P, so it's OK. They are signal diodes so, I guess there will be no problem with capacitances (frequency response)
I drew the schematic in a way that I can understand it better, using the symbols that I usually use. Now I understand some things.
For instance, I don't think that the -600V rail should be really necessary. I think they just used the rail that was really needed for the CRT, and that was already there, so they used it. I think that I only required a negative voltage which allows me to adjust -100V in the pentode supressor grid.