Bartolini NTBT Preamp Help!
I was given a Bartolini NTBT 9v Preamp for free! Yes, FREE!
It has Volume, Blend, Bass, and Treble. However I would like to install it in a bass with only one humbucker pickup. So here is what I am thinking:
1. Some how split my humbucker pickup and blend between the coils.
2. Replace the blend with a passive tone control.
3. Remove the blend completely from the circuit.
I really need help with the wiring schematic though, not sure how to rewire it to make it work.
Ideally I have 4 holes in the bass, I would like to have them filled with some kind of control.
What I would do:
Remove the blend pot.
Find a rotary switch for coil split (series-parallel-single coil).
Make sure the volume pot is at the output of the preamp (not at the input).
What about the wires coming out the from preamp to the blend? Cap them?
How big of a rotary switch? How is it wired?
anyone have an idea about adding a passive tone?
i have pots and caps here so i can finish this today, rather not have to buy more.
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.
So the yellow wire from the preamp to the blend is a hot lead and the black is the ground, remove the blend and wire the pickup into those leads from the pre?
I found these with a quick search:
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