The continuing story of starting with just a K1801 preamp and assembling a complete system. Tonight - The interconnect cable, well one end of it.
TiN was correct it's an 8 pin RJ50 style connector. I used PN 520424-3 to work with the 24 ga wire in the unshielded CAT 5 cable that I had handy.
The correct tool and die to crimp this connector cost about $10,000 with a several week lead time. That price seems reasonable,
however the lead time was an issue for me. So I used a screwdriver that I had on the bench. The screwdriver blade is 0.215" wide and 0.030" thick. It could have been slightly less thick. I inserted the 8 wires, lined the screwdriver up with the first gold contact and thumped the handle a few times. Repeat 7 more times.
After I was finished I read the connector assembly documentation. It turns out I over thumped the contacts. When correctly positioned the contacts should be 0.270 +-0.003" above the back side of the connector. My contacts were 0.250", oops. The continuity is good even as I move the connector so just be careful if you try the screw driver assembly method. That what I get for not waiting a few weeks for the correct tool.
I finished assembling the connector with two metal shields and the rubber boot. It ended up looking very good. I could have used shielded wire but my A10 does not pick up noise on the output wires so I was not to worried about this cable.
Digikey has all the parts in stock.