Understanding the opamp in ds-1

[JIG]

This may be second nature to you guys, but I am coming from a tube perspective and am not quite unterstanding the bottom of the second half of the opamp.

R11 and c7 in series from pin6 to pin 7 of opamp with the junction of r11/c7 to wiper of distortion pot. pin 1 of fot to junction of pin7 opamp/c7. pin 3 of pot to r13 inseries withc8.

I keep trying to think of the opamp in terms of a tube but I think I am a bit off track. In a tube, r13 and c8 would be in paralle with each other and r8 would set the bias of the tube with c8 defining the distortion character.

could someone shed some light on this please :?:

TIA

JIG

[petemoore]

RG just put this link up, I saved it to faves.
 http://www.hills2.u-net.com/op-amp/op-amp.htm

[JIG]

Thanks. I just found this a bit before you replied. A lot of info to mull over.

JIG