Carl Martin - Crush Zone [traced]

[Manfred]

I traced the Carl Martin Crush Zone distortion and measured the voltages at the transitors.

[Intripped]

i assume the original pedal is not true bypass, there's a DPDT switch fitted in it, but i see a 3PDT switch in your schematic.
so probably you've already modified it, that's ok, but what i don't like are the pulldown resistors: they are always on the signal, and this is not good; you should put the 2M2 res after the 3PDT switch, and the 100k res before it.

thanks for your work, rock on!

[Manfred]

i assume the original pedal is not true bypass, there's a DPDT switch fitted in it, but i see a 3PDT switch in your schematic.
so probably you've already modified it, that's ok, but what i don't like are the pulldown resistors: they are always on the signal, and this is not good; you should put the 2M2 res after the 3PDT switch, and the 100k res before it.

thanks for your work, rock on!

Thank you for pointing that out, no I didn't modify the circuit, that was my mistake.

Here the corrected schematic:

[Manfred]

I found a modded schematic in my schematic library, and add the mods to my schematic.
I have no idea how the mod affects the sound.
Who knows more about?
I am not sure whether the 39k and 1uF values are right, because the original schematic is small sized and blurred.

[EddieTavares]

The input cap is 220p, is it correct?

[Manfred]

The input cap is 220p, is it correct?

Yes, it is correct.
The added image shows the input capacitor C10,
you can find the imprint "221".

C10.jpg (37.53 KiB) Viewed 2186 times