Hi roginator,
I realize that this toping is very old , but if you still have this schematic ( wsw 811481) please send it to me with better resulution if it's possible for you!(the one that is already here is difficult for me to read) I need it because I found old WSW pre that works on 9VDC batteries, but shares the same cirquit( except the resistor values) and I want to convert it to work on 24VDC.
Here is the diskussion I've started if you want to help me:
