Piano, Organ, and Keyboard/Kimball 300 No sound

Advertisement


Question
I just received an kimball swinger 300 that belonged to my great grandfather. This organ is from the late 60's or early 70's it has been sitting for a while. I get all lights etc. but no sound. I am an electronics technician and have done a visual inspection of the boards as well as verified that the power amp is working and transformer is providing voltage. I'm aware of the boards names etc but I am not really familiar with this organ. Could you possibly give me some insight as to where I should focus my attention?

Answer
Hello Brian!  The heart of any electronic device is the power supply.  If the voltages are incorrect or missing then other circuits cannot work as they should if at all. In an organ this age, the first suspect would be the electrolytic filter capacitors and rectifier diodes.  Make certain you have no ripple by checking with either an AC meter or O-scope.

The key here is the fact the organ has been sitting unused for some time.  Aging electrolytics don't tollerate not being charged at least once a month or so.  

Next, since the organ is silent, check the headphone circuitry to see if the main speaker disconnect is working as it should be.  When headphones are plugged into the jack, the main speakers are disconnected for silent play.  I have seen all kinds of variations on this problem.  

Next, check for bad connections on the stop rail(s) and disconnected commons as well as bad connections on any connectors.  

Piano, Organ, and Keyboard

All Answers


Answers by Expert:


Ask Experts

Volunteer


Thomas Britanyak

Expertise

I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics. If you need a piano's date of manufacture, please go to http://www.pianoexchange.com/howold.htm or http://www.bluebookofpianos.com/pianoage.html I am happy to answer musical or technical questions, however, I CANNOT offer appraisals on pianos or organs. Please do not ask what an instrument is worth. For this service please contact an experienced local appraiser or try the following links: https://mmm1100.verio-web.com/blueb1/appraisal.html or http://www.57piano.com/questions.htm

Experience

I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics.

Education/Credentials
I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics.

©2016 About.com. All rights reserved.