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Piano, Organ, and Keyboard/Thomas Transistor organ- Model 606 Trianon

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Question
Is there an electrical schematic available for this organ?  There is one note off key on each keyboard and I would like to find the cause of the problem. Any help or advise you may have is appreciated.

Answer
Hello James,  The Trianon is a 3 manual transistor divider spinet organ built in 1972.  It sounds like you have a single pitch that is not in tune.  Most of these organs use either individual oscillators or TOS chips which generate all 12 top octave pitches.  These pitches whether they come from a TOS chip or individual oscillators are routed repeatedly through transistor frequency dividers which create all the required pitches for the entire organ.  Any interruption of a pitch leaves the octaves below that pitch silent.  It's kinda like Christmas lights where one light goes out, they all go out.  Fortunately, it sounds like all the pitches are present.  If this is correct, then all you will need to do is obtain a 12 tone electronic tuner or other pitch source and tune the independent oscillators which are usually clearly marked "C", C#, "D", etc., to the tuner's pitches.  The tuning adjustment is usually a coil in the form of a ferrite stick which you adjust by turning the iron core inside the coil up or down.  A schematic would not be very helpful if you are simply looking to tune the instrument.  However, a couple places to go for schematics would be:

http://mitatechs.org/Public_supplier_search

http://www.organservice.com/thomas/thomas.htm  

Piano, Organ, and Keyboard

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Thomas Britanyak

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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

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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.

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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.

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