CBS Arbiter Doubler

Thanks to Pawel for his schematic posted on FSB.  I can't find much info on this one or clips, but it is very close to being a Foxx Tone Machine so that should give you a good idea what to expect.

Pawel traced two units with the second being slightly different, using BC109 transistors, the 100K Q3 base resistor is 150K, the 5n cap is 3n3, and all pots are 100K log, so build whichever one takes your fancy, or socket the positions to try both.

Demo of the British Pedal Company Doubler which is a copy

Working voltages as posted by ξεναγός νεκρόπολης:

q1
e 1,11
b 1,65
c 3,95
q2
e 3,49
b 4,02
c 9,08
q3
e 0,56
b 1,16
c 3,55
q4
e 0,21
b 0,78
c 7,82