Let's Get Technical > Troubleshooting Problems

MP-1 high pitch squeal

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kfowler8:
I was doing the rear input jack conversion for my MP-1 and ran into an issue. I swapped the front and rear input jacks with a shorting jack and standard mono jack. When I have a guitar pluged into either jack everything works fine. However if no guitar is plugged in I het this high pitch squeal coming out and it changes when I turn the gain knob on the front. The higher I turn it the louder ang her pitch the squeal becomes. It's not the jacks because ice tried the original ones and have the same issue. I thought I may have a ground issue but it's weird that I don't have the same issue when a guitar is plugged in. Any ideas? Could the gain pot have gone bad?

GuitarBuilder:
Can you share how you wired it all up?

kfowler8:
Yeah I'll try and load some pics later today. I used the instructions on here.

kfowler8:
Ok here some pics. I tried to match the pics with the instructions. Ignore the color scheme for the front jack. Red is going to ground. The front jacl is a shorting jack.

MarshallJMP:
Can't see any pics?

Now the problem you have is that when no jack is connected the input should be grounded,so in your cas this is not the case.
Else email the pics to me so i can have a look?

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