Question about Marshall Music
I have just fixed one of the amplifiers with this fault. It was a poor solder joint on the headphone socket. The ground of the speaker is switched through the headphone socket, so if there isn't a good connection, the speaker volume drops, but the headphone output is still OK.
Posted on Feb 10, 2015
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Posted on Jan 02, 2017
SOURCE: amp or guitar??
I can say with a fair amount of certanty that this is the control knob on your guitar, these are fairly cheap and if you have any mechanical ability you can replace it yourself, there will be some soldering involved so if you can't do that I would take it to your local music store and most have some sort of repair department, this shouldn't be a big bill to get fixed.
Posted on Mar 19, 2009
I saw this symptom last week on a similar amp. It was due to the reverb tank having come lose and being stuck magnetically to the back of the speaker causing wild feedback as you describe. Worth a look before getting out the soldering iron.
Posted on Jul 18, 2009
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