I have an ntbt. paid $100 used.... dang it.
anyhow, the pickup blend on it appears to be a passive dual gang pot before it actually gets into the preamp... so just remove it. the input to the preamp is only 2 wires, not 4. So remove the pot and hard wire your pickup to it. I'm installing mine in my hagstrom 8 string reissue - taking the single output from the cool (but cheaply made and dirty sounding) passive hagstrom pickup selector switch and putting that on the ntbt input. replace the passive tone control with dual gang treble/bass from the ntbt. C'est tout! In theory at least... haven't done it yet... no time.
Aside from that the parallel/series switch is a good idea if you want versatility, but still the preamp itself will give you lots of variation in tone so the basic connection without complex switch wiring will be easy if you want that.
and mine has a passive tone control as well and a push/pull active/passive switch. you can do whatever you want with it, but the actual PREAMP is quite simple - one input from pickup(s), one output to jack, two connections for the treble and bass pots, power supply input, ground(s). I think there might be a couple other things you can do (like messing with frequency points with resistors/capacitors) but those are the basic connections.
Ernie Ball,Carvin,Ampeg,VB-99 ~"Subs are secret weapons...Tonight at dinner Tony levin was talkng about a sub he played in montrael and he loved it..." ~Sterling Ball
Last edited by dkelley : 08-22-2013 at 10:10 AM.