Fender studio bass restoring

[alain]

The problem is that's amp was modified by someone (and maybe the reason why all power supply section burned out ! )

After replacing easily caps, resistors and wires from transformer to stdby switch, now I find many important differences
(especialy after the stdby switch) between this amp (chassis n° 012579) and schematic for n° 012662 (from Tube amp book).
I would like to compare them, and restor it as original if needed.
thanks for help.