Vintage synth drifts out of tune

[DBeck]

Very late resolution but I will tell teh rest of the story has I hate coming across unfinished problems on forums. Someone else might have the same problem as me.

Anywho, I gave the organ to my uncle who worked in the electronics industry. He looked at the schematics and what not. He had it for a while and we had family stuff going on which explains why all this took so long. I'm not quite sure all of what he did but I got it back and the drift is gone and the synthslalom works too even though I don't think he messed with this.

He told me all he did was check some of the circuits and then finally gave the trim pots a good soak with some contact cleaner. I think this was all it needed. This thing's in pretty good shape now. Thanks for everyone's help