Humming Organ
2003-09-22 by Cynthia Webster
Hi Judy! > Message: 1 > Date: Sun, 21 Sep 2003 20:17:38 -0000 > From: "Judy Morgan" <j_jmorgan@...> > Subject: Need repair advice > > Hi everyone, > > I just purchased a Baldwin Orgasonic 71L organ that makes a loud > humming sound and I'm now looking for someone who can help me > diagnose and fix the problem. If anyone in this group can help, I > would greatly appreciate it, as I know very little about electric > organs. Thank you for your time :-) > > Thanks in advance, > Judy > I would start by experimenting with the way that your organ is grounded at the electrical socket or not, and with the cables to the amplifier internal or not. Is there a reverb tank? is it plugged-in? Sometimes those spring reverb tanks don't actually like to be grounded and they can be a terrific source of hum! LOL! Anyway, you might just look in back of the unit and wiggle things around gently. Those cylindrical electrolytic capacitors, (Condensers) often go bad with age, and a major cause of trouble is where these fail at the power supply which of course affects everything. The Power Supply is inside next to the transformer and the AC Wiring. (make sure it is not plugged in when you inspect this part! :) Is there a ground connection here to the guts of the organ, and out to the outside world? (AC mains wall cable). Got a spare fuse? Actually looking carefully at all of the parts on the circuit board itself you can often notice burn marks or "problem areas" yourself. Play Sherlock Holmes if you like. The Electrolytic Caps are easily replaced, however attention must be paid to their polarity. The Black Stripe is the Negative wire, and the Longer lead is the Positive. Try The Organ Section of Ken Stone's Wonderful Site http://www.cgs.synth.net/ http://www.cgs.synth.net/organ/index.html Good Luck! Cynthia http://www.cyndustries.com/