Soundcraft Spirit Studio 1/4 inch Jack sockets Soundcraft part number FH0744 and FH0743

These are the jack sockets used for sure on the Spirit Studio units .

They are not very reliable or can get bent if people push in the non standard type of jack plug thats often seen on old gear

Two types a Stereo one with 6 legs FH0743 that breaks the input circuit , and the other Stereo one with four legs 1 it seems is just used as a support. FH0744