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Thread: Mesa Dual Rectifier PSU Film cap

  1. #1
    Senior Member
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    Mesa Dual Rectifier PSU Film cap

    Hi, can anyone explain the purpose of that .047uF film cap at the input of the choke?
    mesa-dual-rectifier-psu.gif
    Is it a bypass for noise from the diodes?
    Or is some kind of resonant filter?
    If it is a critical value, how does one go about calculating?
    Thank you!

  2. #2
    Supporting Member The Dude's Avatar
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    I think it's to minimize popping when the standby switch is closed.
    Chuck H likes this.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

  3. #3
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    Could be it is to stop the voltage across the switch from going too high when it is opened.
    loudthud likes this.

  4. #4
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    Thanks guys. No head scratching either way

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