This is my version of the Zonk Machine, based on one of the early vero layouts.  I added a switch for the input cap, which is possibly the most unoriginal mod known, and increased one of the input caps from 1n to 2n2.

I used an OC76 for Q1 and Q3 and an OC44 for Q2.  I found this provided the best balance between noise and the aggression of the fuzz.   It was very similar to using OC75s, but with noticeably less noise.  

How does it sound?  It’s a nasty primitive fuzz with a lot of character – I really like it.   The standard 1n input cap is not nearly as bright as you think it might be, but it wasn’t entirely to my liking which is why I went up to 2n2.  The 10n which is stock for a MKI is really meaty – again, perhaps more than you might expect if you have not tried a MKI before.   

The switch essentially functions as a fat switch.  2n2 is good – 10n is about as much as you would want.   

ORIGINAL ZONK MACHINE VERO LAYOUT

The image below is attributed to Graham and his seemingly endless supply of vintage English pedals on D*A*M forum   Note the 25k Fuzz pot and the vero construction.