AC30 TB/6 feedback problem « VOX

AC30 TB/6 feedback problem

Started 1 year ago by skipos

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skipos

Member

When I turn the volume past noon on the vib-trem channel, even with no guitar plugged in, a low-midrangey feedback loop will start. If I turn the volume below 9pm, the feedback will go away. The higher I turn up the volume, the quicker the feedback starts. All other channels are fine. I have been googling around trying to find any discussion of this, with no luck. I bought it in 2000, and it has very, very few hours on it. I rarely crank it up, so I have no idea how long this problem has been going on, or if it has always done this. Any ideas?

Posted 1 year ago

sizzlingbadger

Member

My first guess would be a microphonic tube. You can normally find the tube by tapping on them lightly with a pencil until you hear one of the tubes ring. I would test this while the using the bad channel and with the volume just below the point where it starts to feedback.

Posted 1 year ago

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