Guitarsite Forums Discussion Popular Topics ampeg svt-3 pro crashdown

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  • #19947


    I kinda hope you can help me with this:
    recently i got my hands on an Ampeg svt-3 pro but it has a problem.
    Sometimes it would start OK, however, it has certain
    breakdown problems which go like this:
    Normally, the fan starts at high speed and slows down
    a bit, and after about 10 – 12 seconds the output relay
    clicks and the amp is ready to use.

    In my case, the fan starts at high speed, slows down, but the relay switches on and off (collapses) after just a few seconds, and after this has been going on for a few more seconds, the main fuse blows, sometimes even the automatic fuse for the entire house section will blow and will need to be reset prior to any
    other tinkering.

    What should i check (lamps, 450WV capacitors, the output capacitors, or something else perhaps)?

    Without a schematic, i’m as blind as a wall trying to fix this, so can you also suggest me a site which has Ampeg SVT-3 PRO schematic as i’ve been surfin’ round
    the web with little or no success in this field.

    Thanks a lot.

    SASO ([email protected])

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  • Author
    • #97336

      the fan circuit detects that you have a higher temperature….write and i wil help you… i need to know the secondaries ac voltages of the toroidal transformer cause my svt ii pro main ac is totally damged

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