Bypassing zener with cap

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by boneshaker335, May 22, 2006.


  1. boneshaker335

    boneshaker335 Member

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    Hi,

    I used a Zener top drop the voltage of DIY 5f1 build.

    I know it is probably not necessary, but which cap would you use to bypass the zener (to short the zener noise):

    100 - 500nF?
     
  2. Steve Dallas

    Steve Dallas Supporting Member

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    Probably a .01uF 630V would do it. Did you put it on the CT? I would certainly try it without and see. You may not need it.
     
  3. boneshaker335

    boneshaker335 Member

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    Hi,

    many thanks for the help.

    Yes.

    The amp already works. I would just like to A/B it as an experiment.
     
  4. donnyjaguar

    donnyjaguar Member

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    I don't think the capacitor will make any difference as any hiss will be well filtered by the balance of the parts of your power supply. I would however like to hear if you find it does. :)

    DJ
     
  5. maxwedge

    maxwedge Member

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  6. donnyjaguar

    donnyjaguar Member

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    This may be a silly question, and bitch-slap me if I'm wrong, but wouldn't it make more sense to put the zener on the HT rail going to the output tubes? That is, betwixt the HT supply and the center tap of the output tranny.

    DJ
     
  7. billdurham

    billdurham Member

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    DJ,

    Its not a bitch slap, but you incredible slut! :)

    If you put it where you suggest, the only voltage that will get to the output tranny will be the zener voltage aka 50v. By putting it in the CT or ground leg of the PT, you only lower the output voltage by the zener voltage.

    BD
     

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