1990 Musicman Stingray 3EQ schematic

[vintagekiki]

It doesn't have to, because pin 5 goes to the bias resistors 2M2.

[Helmholtz]

It doesn't have to, because pin 5 goes to the bias resistors 2M2.

Don't agree.
Without DC feedback the opamp can't be stable. Any slight DC offset between the inputs would be amplified by the open loop gain of maybe 10000.
Guess what happens to the output voltage.

[vintagekiki]

DC feedback exists through elements in tone control.

http://www.21frets.com/database/039.PDF ¹⁾
http://www.21frets.com/database/122.PDF
https://elektrotanya.com/tobias_bass-preamp_sch.gif/download.html

[Helmholtz]

DC feedback exists through elements in tone control.

Yes, of course, but the OP said all controls were disconnected.
So I ask, where is/was the necessary DC feedback path?

[vintagekiki]

I am not authoritative to analyze what OP said, and what would happen if it happened.
I analyze Music Man Stingray preamp, and the same or similar concept is at Fender, Tobias and other active guitars.

[Helmholtz]

I am not authoritative to analyze what OP said, and what would happen if it happened.
I analyze Music Man Stingray preamp, and the same or similar concept is at Fender, Tobias and other active guitars.

My question and post #15 were not adressed at you but at the OP.

[vintagekiki]

Sorry I misinterpreted the post
I don't understand (addressed to me) posts # 17 and # 19 ¹⁾