Sonic Frontiers SFL-1 rev.3 1994, electrical scheme needed

Hi everyone,

I'm looking for the wiring diagram of the 1994 Sonic Frontiers SFL-1 rev.3 preamplifier.

I found a wiring diagram on the net but it doesn't match my model.
I have also contacted PartConnexion, with no success.

Can someone help me?

Thank you!