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Cap Across PT Secondaries

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  • Cap Across PT Secondaries

    Got this Orange amp here with a 10n cap across the HV secondaries. The cap failed, and the amp is obviously fine without it, but customer would like it replaced. Can I use a 3kV ceramic disc cap like : https://www.mouser.com/ProductDetail/75-564R30GAS10
    or does it need to be a safety cap, like : https://www.mouser.com/ProductDetail/871-B81123C1103M

    Also, why is that cap even there, and if it is so helpful, why don't all amps have them?

  • #2
    The cap is over rectifier to suprime switching transients as main purpose, I think. Look over x/y class type suppressor cap..? , non shorting type Just my 2cents...
    Last edited by catalin gramada; 07-11-2020, 06:17 AM.
    "If it measures good and sounds bad, it is bad. If it measures bad and sounds good, you are measuring the wrong things."

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    • #3
      Most high voltage disc type capacitors are OK in that position.
      The purpose is to smooth out transients but they are not very useful.
      Support for Fender, Laney, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk
      If you can't fix it, I probably can.

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