Question about Orange Amps Orange Amplifiers Thunderverb 200 Series TH200HTC 200W Tube Guitar Combo Amp Orange

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I get a buzzing noise when my thunderverb 200 is idling

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Turn on the ground lift and/or make sure the unit is properly grounded

Posted on May 27, 2011

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  • ross611 May 27, 2011

    my amp does not have a ground lift and it is properly grounded.????

  • Norman Skinner
    Norman Skinner May 27, 2011

    If you don't have a ground lift, you may be stuck. Try different outlets in the house though.

  • ross611 May 27, 2011

    maybe it is just the filaments from the tubes buzzing?

  • Norman Skinner
    Norman Skinner May 27, 2011

    It's possible that one of the tubes may be degraded and needs replacing, but any amp with a grounding issue will hum. Check the unit with no instruments plugged in. If the humming stops, check the instrument and it's cable for loose or missing ground connections.

  • ross611 May 27, 2011

    the tubes tubes are pretty new and were matched and run in. i have disconnected all cables etc and still that hum. not loud but annoying!

  • Norman Skinner
    Norman Skinner May 27, 2011

    Any tube amp I have ever used has some hum when turned up loud with no input.
    It wasn't til we moved over to MOSFETS that I was able to attain full volume silence with no input.

  • Norman Skinner
    Norman Skinner May 27, 2011

    Here's a possibility though, check the capacitors filtering the power supply right after the rectifier. Replace them, and upgrade them if possible to a higher uF rating. Make sure you use an equal or higher voltage capacitor, and be sure to note the polarity when replacing it. This can actually help a lot, especially if the filter cap has degraded.

  • ross611 May 27, 2011

    i would do that but the amp is only about 6 months old!



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