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 Mt-2 metal zone volume issues
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shinychrome0
Copper Member

USA
8 Posts

Posted - 10/27/2009 :  06:45:01  Show Profile  Reply with Quote
I am trying to fix the volume issues on an MT-2 for a friend of mine. Here's whats happening: When the bass is more than about 75% of the way up, and there is a decent amount of distortion, the volume sounds like an overcompensating compressor. It gets pretty quiet and then comes back up to normal volume. This takes about a full second and a half. I lowered the value of the output capacitor (C1). It didn't change anything. I've seen other pedals that can begin to oscillate a little if the output cap is made too large when trying to increase bass output. Its a 1996 model according to the serial number tool here on the forum. Has anyone else experienced this?

Laurie
Double Platinum Member

Canada
4854 Posts

Posted - 10/27/2009 :  13:54:27  Show Profile  Visit Laurie's Homepage  Reply with Quote
Sounds like it *might* be a capacitor. Either that or it weill be a dodgy opamp.

Try changing the 1uF capacitors in the signal path to metallized polyester. C3, C4, C11, C21, C37, and C39.
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cctsim
Silver Member

United Kingdom
418 Posts

Posted - 10/27/2009 :  14:57:01  Show Profile  Reply with Quote
Did you change the clipping diodes ? or applied any other modifications ?
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shinychrome0
Copper Member

USA
8 Posts

Posted - 10/27/2009 :  14:58:12  Show Profile  Reply with Quote
I did quite a few other mods, but it was doing this before i ever touched it, and nothing else i did had any effect on it whatsoever.
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