Steve L.|| May 17, 2011 - 11:08 am|
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.
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?
Steve L.|| March 25, 2011 - 08:32 pm|
|Fascinating, Mark. Thanks for checking-in. I will contact you by email. |
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
Steve L.|| March 21, 2011 - 07:41 am|
That's interesting about the boards. Where did they come from? Feel free to post contact info, if you wish.
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.