Originally Posted by joeyl
I have the John East preamp along with a genuine Musicman pickup using the permanently active setup. I really like the sound combo as it sounds pretty close to the classic Stingray tone.
My question is this: if I wanted to put a passive switch (to use the bass with effects and such, sounds better to my ears) I would have to use a 250K pot for the volume. I know the volume goes after the preamp stage but would it affect the sound when the preamp is active, as in changing the classic Stingray sound?
Yes it could do if the volume is a backed off in active. If the volume is max, no change. If the volume is backed off, depending on the cable and input impedance of the rig being fed, you could loose some of the very high end.
The circuit shown, is very old and not a true bypass BTW.
It ideally should be a full bypass (my bad!) because the preamp has variable loading on the pickup at higher frequencies according to the setting of the treble control, and will affect things in passive mode with that circuit.
In active, this interaction is all part of the charm of how the MM pickup interfaces to the electronics.