'86 bt5
The 1986 BTs had an Active 2-band concentric bs/tr circuit. No mid, no trim pot. Nothing to adjust other than to have the bass in its best possible condition.
We had also made some passive Basses from 1980 to '86 or so with a passive circuit, no battery in side. We made these in both NY and PA. Most were made in NY. These had one large knob and two small ones and one or two switches. Stand-by at the end and Phase in the middle. Some might be without the phase and some might not have a switch at all. I can't remember all the versions. The Stand-by was great for doublers, putting the Smith down to play the upright bass with out touching any controls and leaving it plugged in, no battery to drain.
Unless I see the Bass in question, I am at a loss to comment further in this particular Bass.
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