jhaible wrote: > > there in are a few > > schematics of the Tiracon 6V, I will try to scan them and put to my > > webpage. Also a description of the Double OTA IA317. > > A cloned version of the NE5517 aka LM13700 ? > Just a wild guess. At least the IA 317 is pin-compatible with the 13600/13700. > Darlington buffers included ? Yes. Ingo