[Jukebox-list] AMi rack motor...

[Justin S.]

I was over at a buddy's to check out an AMi D he just finished. He did a 
nice job but there is a bug in the machine that even has me scratching my 
head. When the rack motor runs, there is considerable hash/noise in the 
speaker. A quick pull of the phono input confirmed it's not coming from the 
cartridge or lead-in. Either the motor is generating noise picked up by an 
unshielded tube, or coming back through the DC line? The brushes in the 
motor are good and well seated. I have had a variety of DC motor bugs over 
the years, but never seen noise to this extent. The motor itself runs fine 
with plenty of torque and proper RPM.  I am considering a cap to ground on 
the DC line to shunt this. Anyone dealt with this before? Thanks, Justin

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