Replacing voltage regulator tube with Zener diode

Thread Starter

imke

Joined Jun 24, 2016
2
Bought a capacitor leakage tester, custom made, from ebay. Trying to replace two OB2 voltage regulator tubes (107 volts each) with two 110volt zener diodes, 5 watts, wired in series, and reverse biased, as required. Circuit stabilizes , after slowly climbing, at 238 volts; should be regulated at 220. Also, zeners are quite hot after several minutes. Any comments, or suggestions? Thanks.
Mike
 

DickCappels

Joined Aug 21, 2008
6,381
I am sure the OB2 tubes got pretty hot too ;-) It seems your solution is workable.

How much current is running through the Zeners?

Can you post the schematic for us to look at?
 

Thread Starter

imke

Joined Jun 24, 2016
2
not sure; zeners are rated at 5 watts, compatible with tubes being replaced. Can check voltage drop across resistor to confirm.
 
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