Look up "SSL Tech" which is Keith.

He is a master repairman and most likely has the schematic.

He can be found in a google search or at psw.

You may find something useful here: http://www.thediypill.phx.com.br/diy_sontec.htm

There is a goofy hand drawn schematic, but it is small and a bit hard to make out. Looking to build one? I'm trying to talk myself into it...

thanks for the info - i actually have one that i am trying to either clean the cut/boost pots on or just replace them. they are the really dirty and exercising seems to do little. the problem lies in finding the right pots. this is where a schematic would help i think.

Reggie wrote: You may find something useful here: http://www.thediypill.phx.com.br/diy_sontec.htm

There is a goofy hand drawn schematic, but it is small and a bit hard to make out.

To my knowedge, no one has the complete schema for the 250 -- that goofy one is from Sontec.

Unless you build it with HS-1000 opamps it's not a Sontec. It may very well be a nice eq, but never the same.

Have you tried some contact cleaner in the switches? They may be toast, but replaceable.

DC