Hello all,i am new to this site and to Guild amps.I just picked up a 66 or 67 thunderbird amp,12",8"speaker combo w/7591a output section. I'm am looking for a schematic for it and also some direction as where to find so nice 4 section main filter caps for this unit.Any help and/or comments would be greatly appriciated!Also not to keen on using the stock speakers,don't want to damage them....any ideas for a good replacement