Marshall JMP-1 Midi preamp

goldtop5 · 06-11-2007, 08:28 PM

Hey guys. I'm working on a Marshall JMP-1 midi preamp. The problem is that when you send signal in, you get a really weak and distorted sound. It gets that way when you strum harder on the guitar. Any hints?

PerroGrande · 06-12-2007, 03:38 AM

Try plugging in a pair of headphones and see if you get the distorted signal or if it works properly. This will help isolate whether the problem is in the solid-state portion of the circuit or in the tube stage. (assuming the schematic I'm looking at is reasonably accurate, of course)

06-11-2007, 08:28 PM	#1
goldtop5 Member Join Date: Feb 2007 Posts: 25	Marshall JMP-1 Midi preamp Hey guys. I'm working on a Marshall JMP-1 midi preamp. The problem is that when you send signal in, you get a really weak and distorted sound. It gets that way when you strum harder on the guitar. Any hints?

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06-12-2007, 03:38 AM	#2
PerroGrande Junior Member Join Date: May 2007 Posts: 12	Try plugging in a pair of headphones and see if you get the distorted signal or if it works properly. This will help isolate whether the problem is in the solid-state portion of the circuit or in the tube stage. (assuming the schematic I'm looking at is reasonably accurate, of course)

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