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My 75 fender champ Hums loudly when I turn it on.

The amp was working perfect and today when I turned it on as it warmed up it began to hum and got louder even with the volume @ ''0''. I immediately turned it off. I have tried other tubes and there is no difference. It almost sounds like a ground hum amplified. Any Ideas please. Thanks, Dereeldeel

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Check all the solder points on the capacitors in the power supply. I'm talking about the big can type caps. I've seen this problem on a lot of amps. Good Luck.

Posted on Jan 16, 2009

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I left my fender frontman 65r on for over a year and yesterday a gentle hum for a few seconds then a loud hum for a few seconds more then no more power to the unit. I opened it and troubleshooted it around...


Why was it on for over a year :D Has anyone replaced the fuse? In the service manual I found it has to be only 2 Amps! Okay let's solve the problem. The power transformer was overloaded which caused the broken winding. It is still overloaded what can be heard by the hum sound. First thought was to check main capacitors or better just replace them! If the hum gets louder, they might also become warm. Check voltages after bridge rectifier and smoothing circuit. They should be +/-42 V (TP3, TP4) and +/- 16 V (TP5, TP6) Let me know which of them is faulty Cheers

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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.

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You take it in for electronic repair. Unless you are electronically adept at troubleshooting and repair this is not DIY. Probably one side of the PA transistors has shorted. You can blow the speaker if you keep trying to use it this way.

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When I turn on the amp, I get a loud hum. plugging into the jack doesn't change anything. turning the dials doesn't change anything. when I turn off the amp it makes a loud crack.


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.

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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.

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I have a Fender Telecaster guitar and a Crate amp that cuts out i


The next time it stops, unplug the cable from the guitar and touch the tip of the connector with your finger. If the amp hums, then the amp is still working and the problem is in the guitar. If there is no hum from doing this, then the amp has am intermittent.

Try this before it fails to see what to expect in the way of the hum from this test.

Common problems with the amp are OFTEN with a broken input connector or bad switch on the preamp output jack if it has one.

There are MANY other things and without troubleshooting it is hard to steer you to a fix.

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Replace C21 (10uF/50V) and C38 (2.2uF/50V) and it will work great.

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