Guvnor happy mistake, what did i do?

[erick4x4]

I was experimenting with changing the opamp, and noticed I forgot to solder one side of C6 (.068uf, GGG layout). So when I "fixed" it I didn't like it. I found that leaving C6 out gave me more output, and seemed to help make it less fizzy.

What exactly does C6 do? All 3 tonestacks still work, though it seems like the mid only cuts below 50% doesn't boost much without it, but its worth it to me for the sound improvement.

Anyway I will probably stick a switch in there, but I would love to know what that does.

I learned just a little about tonestacks from playing with the Duncan TSC, but this one seems different, so I can't tell what each part is doing?

Thoughts?

[petemoore]

  Capacitors block DC, and provide increasing resistance to lower frequencies.
  I would lift and insert it to tell the difference, then study the schematic to see why what changes it makes are made.

[R.G.]

An interesting experiment would be to put in the normal C6 and a 10pF cap, then to switch between them. The 10pF cap will simulate c6 not being there, but also not messing up the DC bias.