Hey guy's. I'd like to do a fixed depth mod on my 2266. I've done one on my DSL/Plexi and 2204 but i can't locate the negative feedback resistor where to install the cap. Can anyone be of assistance?
I'm not sure if you already have the other part of the schematic, but this may help http://www.ampix.org/albums/userpics/12095/2266_PreAmp.pdf
Check out pin6 on con6, it goes to the presense pot. Matching up the pins of con6 to con5 of the schem you had looks right.
Link2 from the OT 16 ohm tap is not used. But Link3 from the OT 8 ohm tap is being utilized. A capacitor of an appropriate size in place of the LINK will act as a resonance/depth modification. I believe that is what you are trying to achieve.