selenium HV rectifier

[cbenham]

Originally Posted by DaveWM

anyone ever try using a modern HV diode in place of those somewhat hard to come by rectifiers? I see there are 10kv diodes that are easy to get.oh this is for the focus not the HV for the CRT anode.

If the set used seleniums originally, you can replace them with newer seleniums or probably HV silicon rectifiers.

However, if the original was a tube, I'd still use a tube. Using a selenium or a silicon diode may overload the flyback transformer because the capacitance is so much higher and the reverse resistance of these diodes is so much lower than what the tube offers.

I've tried this with both solid state plug-in 1B3s and 3A3s, etc., as well as for 1V2s in B&W and color sets and found this to be fairly universal.

Stick with a tube if the original rectifier was a tube. Just my experience.

Cliff