3-500Z, etc

[Multi-Volti Devices]

Hello:

Anyone know the details of the procedure for rejuvenating thoriated tungsten
cathodes (i.e., 3-500Z in SB-220) when they are well worn?

It's something like filament only at a certain % elevated filament voltage
for a certain time.

I'm not looking for K temperatures...I have info on that, but I can measure
voltage but not the temperature.

I'd like to read it myself if it's in an article or old ARRL handbook or
Bill Orr Handbook.

Thanks

Murray

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