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SVT-4 Pro fans sounds like dropping bombs at startup!

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  • SVT-4 Pro fans sounds like dropping bombs at startup!

    Anyone else run into the strange fan noise at startup with SVT-4 Pro amps? I have three of them currently that all do this.
    starts out super high pitched and works it’s way lower till the fan kicks on… sounds just like a bomb dropping out of the sky.
    I first assumed the fan bearings are just worn, but the noise is up until the fan starts… almost the sound of a camera flash charging up. But backwards. Capacitors? Or the fan motor itself possibly emitting this noise struggling to kick on? Strange noise for sure.

    Hopefully some of you know what this is.
    only lasts a few seconds at startup.. so not a major big deal. But it is a bit annoying having three of these that do it.

    I’ve read on threads of people saying theirs always has done this. Doesn’t seem normal though.

    Thanks hive!

  • #2
    If you temporarily disconnect the fan, that will tell you if it's the motor making the noise or not.
    Originally posted by Enzo
    I have a sign in my shop that says, "Never think up reasons not to check something."


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    • #3
      Fan should be silent. replace it if it isnt.

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      • #4
        Apparently, after further research. Lots of these amps do this.. many have done it for years.. it’s only for a few seconds at startup, so definitely something that could be tolerated.
        will leave it up to the owner.
        thanks for the info!

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