I gutted an old PC power supply and loaded it with the guts of my 1998 American DLX P.
Sounds the same as if it were in the body. Works the same too, unplug to turn off.
I replaced the MID control with a mid boost switch. It is either flat or boosted. Boosted is pretty much in your face. Flat is, well, flat.
Sounds great with my new Jazz I put together: NBD...yep.