Understanding why my DIY tripple-fuzz blew up

[knutolai]

A while back I built a triple fuzz pedal consisting of

No Joke Fuzz - Muff Fuzz - Another No Joke Fuzz

Schematics:
http://i.imgur.com/J0o9c.png
http://fuzzcentral.ssguitar.com/schematics/mufffuzztransschem.gif

Each fuzz has its own volum and bypass control. The pedal also has a master-bypass and a passive positive feedback loop. (going from output to input with a resistance of 5k to 500k).
It should be noted that when all 3 modules are active the pedal is non-inverting.
After playing around with it on some extreme settings the first No Joke Fuzz transformed into a white noise generator
Up until this point I was able to produce some killer sounds with the pedal (I do noise music  )

Soooo my question is: Are there any glaringly obvious design flaws that I should have been aware of when I put this thing together?

I do realize the No Joke Fuzzes has no pull-down resistors on the input. I know this decides the impedances of the pedals, but is this also a design component that keeps the pedal from being blown apart when introduced to a very loud signal? My goal is to put together a new and secure version of this pedal.

[LucifersTrip]

I doubt if anyone'll be able to help much unless you show the exact wiring you used

you haven't even mentioned which component(s), if any, went bad...

[garcho]

Were those transistors Nitrates or Germaniums? 

[knutolai]

I used only silicone transistors.
The wiring would be putting as following:
The exact schematics in the order i wrote, volumes at maximum and a resistor of 4k7 ohm from the output of the last No Joke Fuzz to the input of the first No Joke Fuzz (feedback at max).
The reason I didn't go through with the trouble of putting together a schematic specifically was that I suspected the problem with the design in general could easily be spotted. sorry  
Ill try to have a full schematic up soon.

Im pretty sure I damaged the transistor of the first No Joke Fuzz. The two other circuit modules are still intact

thanks for tuning in!