Question about Fender R) Pro Junior III Guitar Amplifier - Black

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Pro Junior III Guitar Amplifier - Hello,When I turn it on there is loud buzzing noise that does not change with volume.Thanks

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There is likely one of three problems:

Blown rectifier in power supply.

Bad filter capacitor(s) in power supply.

Shorted power amp chip causing the riple on the power supply to reach the speaker.

Posted on Mar 14, 2011

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