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Thread: VOX AC15 Heritage... TB Channel bleeds into the EF86 channel.

  1. #36
    Senior Member SoulFetish's Avatar
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    Quote Originally Posted by Cooper1962 View Post
    I'm curious... What does this diode + capacitor + resistor circuit assembly do?

    Attachment 54195

    To me it looks like it presents an impedance to ground currents, so they donít loop through the chassis. The cap I would imagine is so any HF that ends up on the power supply has a low impedance path to the chassis.. the diodes are usually there to pass fault currents in the event of an electrical failure.

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    Quote Originally Posted by Jazz P Bass View Post
    I have that on Marshall amps.

    Some kind of reverse protection chassis reference.
    Thank you.

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    Quote Originally Posted by SoulFetish View Post
    To me it looks like it presents an impedance to ground currents, so they don’t loop through the chassis. The cap I would imagine is so any HF that ends up on the power supply has a low impedance path to the chassis.. the diodes are usually there to pass fault currents in the event of an electrical failure.
    Thank you. I didn't get a chance to work on the amp today.

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    It's still bleeding over, so it's not an issue with the caps that I replaced.

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    Quote Originally Posted by Cooper1962 View Post
    It's still bleeding over, so it's not an issue with the caps that I replaced.
    I don't understand, did you shunt different points of the circuit with the capacitor "probe" like we talked about? What caps did you replace?

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