The Jordan Bosstone is a Fuzz circuit was first released in 1967. Its a trebly fuzz, with a fat, thick and saturated tone. The first version of the Bosstone was designed for directly plugging it into the guitar.
Its consists of 2 transistors, one NPN and one PNP
Heres a cool little readup of the story of the Bosstone:
Today there are some official Bosstone clones, for example from VodooLab andof course many DIY projects.
I chose the Bossman PCB from rullywow.com. The pcb is very small and fits into a 1590A nicely :)
This is my first 1590A build