I'm using a Fender Jazz bass 5 string passive,i want to boost the output only,not change the tone in anyway,so perhaps some kind of buffer amp run on 9v which i can put in the control cavity?does anyone know who makes such a device?anyone got any other ideas,thanks.
You could use a Marshall Bluesbreaker II if you want a transparent boost, or a Guv'nor II which has a pretty useful 4 band EQ - just turn the drive down. Or a compressor pedal will boost too.