Success !!!  Alex Dumble your imagination has come to life again. One day to clean all the old pots an re-wire the Humbucker circuit with a new On-On switch for that cuts the Gibson choke in and out. That was great, and the Humbucker sounds great again, with an .047 orange drop cap.
DAY TWO: With the all the parts and push-back wire in hand I solder up the 3 pole/4 position rotary switch to my diagram. Months of  planning an years of waiting have all been worth it. I my plug 1967 Gibson EB-3 Alex Dumble Modified 1974 via it's XLR stereo jack to Y split to 1/4" plugs, to in-line Low-Z to High-Z transformer on 1/4" plug #1 and into 4 channel mixer channels 1 & 2. Out of the mixer/ Into my TC Electronics BH800 an VOILA!! Sound, Sound and More Sound.  All 4 positions work....and with a few minutes of alligator clipping in a selection of different caps...lo and behold the Kemet Aluminum Electrolytic 35v/4.7uf capacitor is the best sounding of the bunch. I want to thank everyone here on this thread (also posted on Pickup Makers Thread) for helping me complete this project. Perhaps one day you will hear this amazing sounding bass on a record somewhere.
P.S. the cool sound this bass gets is the combination of the very clean neck low-z pickup....which today I am leaning towards the cleanest #3 parallel position mixed together withe the Humbucker, choke on, .47uf orange drop tone turned a little bit in. I have La Bella "DeepTalkin'" Flatwound strings and run it all thru the mixer an TC Electronics BH800 and a 10" kevlar speaker in a Trace-Elliot BLX-80.  It used to be an Ampeg B-15, with an Electro-Voice 15". The Trace-Elliot sounds better, a very tight speaker. The BH800 has the tone bumped just a little on the mid, mid-high, and high.  Jack Bruce would have loved this little ax and rig.

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