Discussion about the Korg PolySix synthesizer

Hi Florian
Thanks for the suggestion.
ICs 31 and 24 both have sockets on them
so someone changed them in the past.
I fitted new 4051s into the sockets but I`m still
getting -13v on IC18 pin7.
My Polysix is new production.
Any further suggestions would be much appreciated.

Many Thanks

Dave