Circuit Overview:
The trilogy combines some divide down based fairly simple string/organ sound with 4 organ drawbars and some phaser effect for strings, with a synth section, featuring sync or free with a phase led like the polymoog. The 'paraphonic' nature of this instrument is unique! It uses 6 envelopes and filters apparently, one assiged to the C's and F#'s, one assigned to C#, G, and so on! An interesting compromised approach to this kind of design.
Service Tips:
Always verify voltages of course on old instruments first. Mine had a bad CEM3330 I recall which can be tough to find. Missing note on one osc. is usually a bad TOS. Missing/noisy notes below certain point bad divider. Missing groups of notes something bad in synth cards. (Eg. bad C and F# all the way is bad card #1 since notes are grouped in half steps up from those notes to each successive card. Eg. C# and G to card 2 etc.)
Parts:
Lots of discrete parts but likely some oddball ones. Ask if you need a specific part.
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