Vintage Bartolini TCT Bass Guitar Preamp: Testing, Pedal Build, Audio.

This is the same onboard preamp that Marcus Miller has in his 1977 Fender Jazz Bass. It was installed by Roger Sadowsky in the 1980's. In this video I turn one into a guitar pedal. After some testing, I decide the pedal needs a fet buffer on its output.

My "Boost Only" Fender Tonestack Preamp:https://youtu.be/15VOS98stpc
My pot shaft trimming jig:https://youtu.be/TLhu4nByCls
Using a P-channel mosfet as reverse polarity protection:http://www.geofex.com/article_folders/mosswitch/mosswitch.htm