A photo essay documenting the creation of Optigan discs.
Optigan Audio-Output Mod
Here’s a freebie from the Service Manual – it’s instructions on how to modify the outputs on your Optigan to be more suitable for recording and amplifying. Optigan Audio-Output Mod [pdf]
Optigan schematics
yes its true, a service manual *still* exists 34001 (in .pdf format) 35001 / 35011 / 35012 (in .tif format) 35002 / 37003 (in .tif format) You can also purchase a pdf of the entire Optigan service man