Comments for page: MXR Preamp

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Posted by Steve L. May 17, 2011 - 11:08 am
Hi Matt,

It's so nice to hear from another MXR Preamp owner! Sounds like you have found a great application for its unique features. I take it that the M-140 was titled as "System Preamp" instead of "System Preamp II" ?

The mods I made weren't much. The basic performance of the preamp is excellent as-is. I removed one of the two phono preamps, making that input line-level for a CD player. I also made the power outlet switched, so that I can control the whole stereo system with it.

Very glad that the schematic and manual are helpful. Thank you for the kind message.

Sincerely, Steve

Posted by Matt May 17, 2011 - 10:26 am
Just wanted to say thanks for the schematic and manual! now I understand what the low pass filter button does...

I must have one of the rare M-140s, but more or less looks exactly the same (minus the stereo reverse function I think). I bought it on HarmonyCentral 5+ years ago and have been using it as my guitar rig preamp since. I used to run the loops into my eq and fx, which let me balance wet/dry easily... Works great, sounds great, looks vintage cool of course too!

What mods did you do to yours? anything easy you would recommend?

Thanks, Matt

Posted by Steve L. March 25, 2011 - 08:32 pm
Fascinating, Mark. Thanks for checking-in. I will contact you by email.

Posted by Mark C March 25, 2011 - 08:11 pm
They where from MXR...never completed. I was trying to find out what they where and came across your site

Cameron_amps "at" yahoo com

Posted by Steve L. March 21, 2011 - 07:41 am
Hi Mark,
That's interesting about the boards. Where did they come from? Feel free to post contact info, if you wish.

Posted by Mark C March 21, 2011 - 01:27 am
I have a bunch of circuitboards for this preamp
Write back if anyone is looking.
Ill check back....let me know.


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