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Search for Bass preamp schematic Treble/bass stack

Build or buy? I'm not clear on that.

-- 2-band Stingray I built into a pedal, but is designed for internals. This thing is smooth. I dig it:
My thread: Fæpboeœx II: 2-Band Preamp

-- 3-band Stingray that built up quite a following here. This thing is hot. I dig it:
Original thread: DIY Stingray 3EQ Preamp
My thread: Fæpbœoex III: 3-Band Preamp

-- I'm working on a mashup of the two, in a 2-band form. Not complete, but will soon be. It will be smooth and hot. I'll dig it:
Modding a Schematic: hybrid-ish pedal -- help!
 
I need some for 4 knobs and it can include active/passive switch.

Then wire it with four pots. Active/passive switching is universal. (Not specific to any particular preamp.)

Apparently this is a Bartolini NTMB schematic, but I cant say for sure. Wire it for two-band operation, if you use it.
NTMBschem.jpg