Conn 643 organ modification, dual input insertion. Noise Organ. We started by exploring some of the many signal lines tangled through out the organ leading from one of the sections to another. I identified f1 on the upper right hand of the circuitry rather quickly.
Attach red gator clip from ground bar of circuit to shield of a guitar cable and a green clip from the f1 insertion point and the signal wire of the guitar cable. I routed in line with other wires in unison with existing wires to ensure proper lid closure. This was connected to the channel 2 of the new organ insertion section. We will go over that later. The second point of insertion was a little harder to see, but was a real gem. On the left hand side behind the phantom bass switch area is wire 14. We followed the same steps we connected the ground to the shield and 14 insertion point to a guitar cable. For the input section I used a 2 by 1/4″ and 2x xlr inputs flush stage mount. By cutting a hole on the left hand side of the lid. Giving good access. XLR still not hooked up. The thought is to mount the preamp into the organ to reduce clutter. In addition to the input modification. I added a 1/4″ jack to the rear speaker usually used for pipe stack speakers or stereo speaker tone cabinets.This allowed us to connect the conn 643 organ to my old hammond organ input. To expand this idea 2 additional 1/4″ inputs were installed inside of a wooden cigar box. Effectively giving 3 inputs.
The reasoning for multiple insertion points was to gain variety in sound from entering the circuitry at various stages of the power and non power portions of the circuit. Channel 2 or wire f 1 of the input represents a clean true input for my guitar, some my require a level mine does not. With stereo function and leslie sound shapes available. The Channel 1 or wire 14 how ever is interesting. It allows the input to be controlled by the tremolo portion of the circuitry which includes tibia repeated with speed controller. Effectively turning it into a single function wave controller which when blended with a sound set up or various other functions peels wigs off. It is also susceptible to control via the tremolo modifier which holds 5 distinct settings. More to come but this is a example of this single function while using phone mp3 as input.