Ok to use a non polarised cap on the 5e3 power tube cathode?

Discussion in 'Shock Brother's DIY Amps' started by TonyOz, May 17, 2021.

  1. TonyOz

    TonyOz TDPRI Member

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    I'm thinking of replacing the 25uF 25V electrolytic cathode cap on my 5e3 output tubes with a 100V 25uF non polarised cap. Its physical dimensions are bigger than the cap it will replace, but it should still fit.

    The reason: my Cathode voltage is currently around 24V, close to the 25V rating. Plus, for brief periods during initial testing, this 25V electrolytic was exposed to around 40V, i.e. 15V over its rating, and may have been compromised. That said, the amp works fine.

    Will there be any issues using the non polarised cap here? I like the 100V rating, but there may be other factors I'm not aware of.
     
  2. jimgchord

    jimgchord Tele-Afflicted

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    You can, they are larger and more expensive. A 25 cent 50v electrolytic is all thats needed there
     
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  3. RLee77

    RLee77 Friend of Leo's

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    Sure… if you have one around, it will work, no issues.
     
  4. Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    .
     
  5. Badside

    Badside Tele-Holic

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    You CAN always replace a polarized with non-polarized. What you can't always do is the opposite. Polarization of a cap is a limitation, not a feature.

    If it wasn't for cost and size, we'd never use polarized caps.
     
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  6. TonyOz

    TonyOz TDPRI Member

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    I was pretty sure of this. However best to check with the wise heads here before trying something new.
     
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