68.13.64.77
I've looked around a bit without success for a mathematical model for selenium rectifiers. If it's a good model, I think forward drop per plate would do. I think that if the drop per plate is pretty constant, like it is for silicon rectifiers, then a good replacement would be a silicon rectifier in series with an appropriate zener; the silicon diode to do the rectification and the zener to drop the rest of the voltage (Vz = [selenium drop - 0.7V).
Anyone?
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