Question about Fender Frontman 212R 100W 2x12 Guitar Combo Amplifier

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When I turn amp on there is a loud humming that does not stop.

The humming is very loud. with all controls turned completely down to one.

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I do not suggest putting a mono guitar male plug into any headphone jack because one side of a stereo signal,for example, would be shorted to ground. You might burn out that side [left or right] of the headphones jack. Anyway, with the amp on and humming, pound the amp chassis or cabinet. If this affects the level of noise, remove the chassis and reflow the solder connections to the two large filter capacitors [with the power disconnected.

Posted on Dec 26, 2015

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Try plugging into a different socket if that doesnt solve problem you may need to replace cord. sounds like a loose neutral in socket though.

Posted on Jan 16, 2013

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SOURCE: when I turn on the amp, I get a loud hum. plugging

i) Disconnect one lead of loudspeaker & insert an open-ended guitar cable into headphone socket.

ii) Put a dc voltmeter across open end jack then turn Frontman ON for a few seconds.

iii) The reading should be about 0volts - if the voltage is high (27v), then it is likely that the PA chip TDA1514A has blown.

iv) If,however, the voltage is correct in iii) , then reconnect speaker & put guitar cable into the POWER AMP IN socket & connect other end to guitar...Turn on briefly, if there is still hum then fault is in the output stages & will require chassis removal to solve.

Posted on Feb 23, 2011

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