Replacing voltage regulator tube with Zener diode

Discussion in 'Power Electronics' started by imke, Jun 24, 2016.

  1. imke

    Thread Starter New Member

    Jun 24, 2016
    2
    0
    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
     
  2. DickCappels

    Moderator

    Aug 21, 2008
    2,656
    632
    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?
     
  3. Veracohr

    Well-Known Member

    Jan 3, 2011
    552
    76
    Is the current through the zeners the same that the voltage rating is specified at?
     
  4. imke

    Thread Starter New Member

    Jun 24, 2016
    2
    0
    not sure; zeners are rated at 5 watts, compatible with tubes being replaced. Can check voltage drop across resistor to confirm.
     
  5. Bordodynov

    Active Member

    May 20, 2015
    641
    188
    Use a Zener diode cooling radiators.
     
  6. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,146
    204
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