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When i turn on my yamaha f20 guitar amp, it produces a hissing/ static radio sound. Is it the power capacitor or something else?

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Possibly interference from another electrical source. This can be compounded by high gain or the use of a distortion pedal. Try moving the amp to the middle of the room or away from things like appliances, lighting dimmer switches computer, tv etc.
Hope this helps.

Posted on Apr 05, 2011

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Posted on Jan 02, 2017

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2: when you press the od switch the amp goes into hi gain mode and will hiss with no input, the point is if you plug a guitar in and play it the volume of the guitar is way above the hiss and you don't hear it

so in conclusion having bought and sold many mg series amplifiers the on you have is perfectly ok

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