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Why are there no 1 volume, 1 tone, 1 switch basses?

I've wanted to change my Jazz to be Volume, Blend, and Tone. I like having a single volume so I can easily boost/kill my sound on stage without having to move two knobs.
I have that on my Jazz Ultra. I pretty much only use the blend pot as a pickup selector. You can’t blend like you do with two volumes because one is always on 100%. If it ever breaks I’ll replace it with a 3-way switch.
 
The circa 1980 Martin EB-18 had this arrangement; so did its Vega counterpart.

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I would have thought Tele-style wiring would be popular on bass. But NO! Why not? I'd like to try it, but have no clue for values on pots or capacitors (2 jazz-type pups). Any suggestions?
Volume, tone, 3 way switch.
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250k pots

Standard Fender capacitor. Not sure the value.
 
The older Yamaha BB's had that setup, I quite like it on my BB415. Simple and effective. I don't need just-so tweaking live, either I'm kicking the J pickup in or I'm not.

(not mine, just a pic to illustrate).
View attachment 4420843
I was going to say the same thing. My BB1100S can run that way if I turn off the active circuit.
 
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Early G&L SB-2 and Lynx.

IMO, master controls suck on multi-pickup instruments. Terrible design idea. The times when I want the same exact tone knob settings on both pickups are...almost never. Thus such instruments lead to constant knob adjustments.

The other thing that sucks about V/T/switch is that you can't blend the pickups. Pickup blending is basically just a passive midrange control, and it can be quite useful in some situations.

I love my SB-2s and my Lynx...but I only ever use them as SB-1s.
 
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