How do I replace this 40+ year old selenium rectifier?

[powertriode]

Check out this URL

http://www.vintage-radio.com/repair-restore-information/valve_power-supply-stages.shtml

Scrool down and look at the section "Alternative Rectifiers"

This is a vintage radio website but same thing; different gravy.

You must fit a wirewound series resistor, as a silicon diode is more efficient than a metal rectifier and without it your HT will be higher.


HTH

 

[anatech]

Trial & error

Hi Darren,
Just try different values to see what the drop is. I would expect around 300V across the filter cap if you gave me an AC figure. That will be lower due to load but clearly above the filter cap rating. The circuit probably ran about +230VDC as a guess, plus or minus.
One nice thing about Selenium rectifiers is that due to the resistance, you didn't get those sharp voltage spikes on the charge waveform. That means a smoother rectified DC. The resistance will do the same thing.
Another thing you could do is use a lower resistance and a voltage regulator circuit. That would be very quiet.
-Chris