Hi everybody, new poster old reader here.
It is about my electro acoustic bass recently upgraded with magnetic pick up as in addition to its original piezo one. โ Problem - tone pot on magnetic doesn't work (no change in tone when turned in any direction).
1. Piezo.
Bass has original preamp with EQ for its piezo, standard thing:
๐ก Note: It works fine when alone as well as after adding magnetic to the same jack output.
2. Magnetic.
I had this idea to put some spare P pickups into the sound hole. Managed to put it there:
Added two pots: 1 vol 1 tone:
Wired them to standard Fender schematics and connected to that stereo jack output to which piezo has been attached, but tone didn't work. Tried all other wiring ideas I found online or in my other basses, but no joy.. This is current wiring:
(Red caps: 0.047uf, 0.047uf, 0.022uf. Green cap 0.0022uf) ๐กNote: the same result when green cap is not connected.
๐ก Note: Sound is bright and clear no matter how you turned that tone knob.
So I replaced pot, replaced cap, replaced wires, tried different caps (single 0.047, two same value, two mixed value or 3 as above), no joy..
๐ก Note: All that time volume pot (for magnet) and piezo system have been working fine. I can mix their levels no problem, eq piezo no problem.
3. Output jack.
Output wires from magnet and from piezo are connected to a stereo jack originally supplied with guitar:
๐ก Note: Preamp for piezo and pots for magnet are not detailed in the picture but are used indeed.
4. Conclusion.
As far as I know all has been soldered correctly, because when testing magnet direct to amp it dumps the tone down nicely as expected (even with 3 different caps and that green one as shown before). However when connected to a jack along with piezo - tone pot stops working and sound doesn't change, tone is not dumped down anymore.
It looks like that piezo system somehow doesn't allow my mag tone pot to dump the high frequencies down to the ground..
Why? How?
I'm sure someone has heard similar story before and solution was found.
Electric gurus please help.
I can't sleep anymore.