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1 Answer

Marshall 210h apm hum problem


sounds like pre amp tube. and you should replace all in that row. never 1 at a time. Good luck.

Aug 19, 2015 | Marshall Music

1 Answer

Guitar amp continuous humming from speaker


Firstly, do not disconnect the speakers from the amp when it is on. Damage is possible.

You have a bad ground somewhere in the hookup. The first suspect would be your guitar-to-amp cord shielding connections at each plug, then, the wiring in your guitar. Try changing each of these to another as a trial, one at a time.

Here is Marshall's spiel on hum

http://www.marshallamps.com/support/faq/hums-hisses/

Mar 11, 2014 | Audio Players & Recorders

1 Answer

Guitar amp continuous humming


Main power supply filter capacitor(s) might be bad.

Mar 11, 2014 | Audio Players & Recorders

1 Answer

My Marshall Haze 40 Amp started making a very loud humming noise after a couple hours of playing.I let it cool down,and turned it back on and the noise came back after a few minutes


may be one of the electrolytic capacitors in the power supply has become leaky...this is a common problem among amplifiers...so you let it cool down..then after a period of time the capacitor heats up and then causes the hum...the power supply caps filter out the 60 hertz ac line noise...which is probably the frequency of the sound it is making...this is a good indication of these caps going bad....another thing you can check is to see if the amp is properly grounded(eg: the ground pin on the plug is present) and that you dont have an open cord or input

Jul 10, 2011 | Marshall Amplification Marshall Haze 40...

1 Answer

Mg smokin makes 60 hz hum


Probably the power amp chip has failed with a short to one of the power rails. This will cause hum and ultimately wreck your speaker. Take in for repair.

May 13, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Marshall MG100HDFX, VERY loud painful humming/noises as soon as the amp is turned on. Cant be adjusted by volume or anything, is this a connection problem?


Likely the filter capacitor(s) have failed OR the power amp has shorted driving DC with ripple into your speaker (very bad). Take it for repair before damage might be done.

Jan 10, 2011 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Marshall AVT20X hums and no sound from the input jack (speaker voltage during humming is 13vDC)


Likely one half of the full-wave rectifier has failed. Take in for repair. Sometimes output amp shorts to one power rail causing this. DO NOT continue to operate this until repaired as it will destroy the speaker!!!

Jan 01, 2011 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

I just replaced the fuse with a lesser fuse now the amp just hums. The pots are all on low and it does this with or without a instrument plugged in


This is likely a power supply problem such as a bad filter capacitor. If the fuse blew before, probably one of the rectifiers blew due to a shorted capacitor followed by one or more diodes failing.
Take unit in for repair unless you are adept at electronics.

Dec 01, 2010 | Marshall Amplification Marshall AS100D 2x8...

1 Answer

Marshall VS65R is powered up it hums


Blown speaker NO (would not get sound at all)

Bad Reverb UNLIKELY (controls would deselect reverb and it would be out of circuit)

Bad preamp tube NO (controls have no effect)

Bad rectifier and/or filter caps LIKELY

Bad power amp POSSIBLE

Nov 29, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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