stevem Messages: 4733 Registered: June 2004 Location: NY
Senior Member
Your issue may not lie on the board at all!
I have had bad resistors on the jacks make for tons of hiss.
The unsolder the jack hot lead from that board and see if f it goes away.
It sounds like you have a schematic for this amp, or at least the preamp boards, can you email them to me if the pc numbers of them are not being in this site's tech section. smag25ra5@yahoo.com