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When i hook up through the loop on my marshall head, connecting cables are being fried.

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If you are frying cables that is bad! This means you have a bad ground loop.

IF that is an old Marshall head that doesn't have a three wire (with ground pin) power cord on it, take it in immediately to have a three wire grounding cord on it before you fry yourself and not just cables. Their old technique of having a switch to change to create a pseudo ground was stupid and VERY dangerous !

You can severely damage equipment due to bad grounds.

ALWAYS connect all interconnected electronics to the same power source or receeptacle.

Posted on Mar 22, 2011

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A educated guess points to either broken soldering or a broken ground on the input jack itself. This is a CHRONIC problem of amps because people trip over the cord and it yanks the cable and jack sideways breaking it or the solder where it attaches to the circuitry.

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How to connect the speaker cabinet to the head?


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PLEASE loop the speaker cables through a handle of the cabinet at each end to avoid them being yanked out while hot as the amplifier can be damaged if it happens.

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The sequence would be that when you started driving the second unit, the feedback paths within it would fight the attempt to drive backwards and the output transistors would first overheat and then short, This would put a shoirt on the power supply and blow the fuse. The damage would be permanent and would LIKELY NOT include the transformer.

Expect the power transistors, driver transistors, associated resistors to go up in smoke. The unit will have to go to a shop to repair. Probably $30 of parts wholesale, but labor is going to cost you for sure. Expensive mistake.
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First disconnect all inputs. If hum is still there, PROBABLY the filter capacitors have gone bad. Replacement is the cure.

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If you only connected the peaker to the wrong connector USUALLY no damage was done. SOMETIMES the effects loop jack which has a switch contact on it MAY not connect again when you removed the speaker connector. Some of these have very weak jacks Try putting a cable into the jack several times and removing to cycle the contact to possibly clean it. The other possibility is if you didn't have a speaker load you might have popped the power amplifier... hope not...
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