Electric organ repair.

[BPJ]

[crochambeau]

Unsure how this one works, but it appears each key is wired, indicating the need of a common reference being fed to the keybed. Make sure that's intact, electrically, and generally poke around some more.

The screwdriver assisted trim pot is probably going to dial over all tuning that the top octave generator is running at.

Confirming there is a pulse being fed out of the top octave would be another step on my short list.

[BPJ]

There's definitely a common reference, you're right. My laptop is busted so I'm having to operate off a telephone, slowing things down because my eyesight is getting worse every day.

This is going to be a very long project. At least it cost me nothing. I'll keep posting here as I go along for the fun.

[crochambeau]

Radical. Thanks for sharing your organ with us BPJ!

The culprit is usually a bit of dirt, oxidization, or failed caps pulling power rails down. Lots of switches and contacts in the works with these. Happy hunting!

[BPJ]

For any body interested, here is a PDF of my organ. I had to email Hohner because there's no reference at all to this model I could find.

https://ufile.io/tetbzkwi

[BPJ]

Very late second part.