Dynacord VRS-23 bbd delay - mod for endless repeats

[beatnik]

Hi everybody

I just purchased a vintage Dynacord VRS23 analog delay and figured out that mine is the later version, it doesn't go into endless repeat mode with the feedback control turned all the way up

I was wondering if there could be a way to modify the unit for self oscillation ?

I guess something has to be changed in the feedback path of the delay signal but I don't really know how

Maybe someone more expert can have a quick look at the schematics and suggest a modification ?

Here you can find a copy of the service manual and larger scans of the schematics which are clearer to read

http://www.florian-anwander.de/dynacord_vrs23/

It seems that R040 on the front panel board is the feedback control pot, this is connected to ne570 companders on main board. Maybe something in this path needs to be altered in order to increase the feedback amount ?