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M-100 - unwanted tone

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  • M-100 - unwanted tone



    This is my first post, so please forgive me if some of my terminology is incorrect.</P>


    I also want to point out that I do not playkeyboards especially well (poor would be a more accurate descriptor) and this M-100 is for my home studio, so that when people who know how to play come over I get the sound of a real Hammond instead of something electronically ...close</P>


    Upper keyboard- if I select the drawbar preset and pull the 1st drawbar out I get a constant tone (sounds like a lower "A") which gets louder as I pull the drawbar out. Likewise ifI select the "Full organ" preset i get it continuosly and at full volume. Full volume is not overwhelm and it is somewhat "drowned" out.... but it's still there</P>


    expression pedal positon and other presets seem to have no affect on it-</P>


    I acquired the M-100 about a year ago and I have replaced the filter caps, the AO-44 amp (which had been removed), replaced all tubes, and diassembled the keyboards to remove the nesting materials of asmall rodent- no sign of wires being chewed and everything else appears to be a pretty good shape and aside from the annoying unwanted tone it seems to work pretty well according to several folks who can actually call themselves musically adept on keyboards.</P>


    Any suggestions on possible cause, or where to look? I'm fairly comfortable with electronic circuits and have built a few tube amp/circuits, can read/follow schematics and have a basic understanding of electronics</P>


    Thanks much for any suggestions</P>


    Stan</P>


    Sacramento</P>

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