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I don't know the original specification of these cables, but I can give you some pointers to selecting suitable calbles. There are differences between 6, 9, and 11 pin cables, so I'll deal with each in turn.

6-pin cables: The signal wires (red/black pair) are a lighter guage than the others, they only handle audio signal at speaker level. Typically 20 watts into 8 ohms for a 147 type, roughly 12 volts, at 1.5 amps, signal current to a 122 is tiny. The other four wires need to be insulated to take mains voltage or the B+ voltage from a 122, because of the B+, typically 2~300 volts I'd look for something rated for European 230 volt mains even if your local mains is 120 volt. Current consumption of a single Leslie is typically 2 amps at 120 volts or 1amp at 240 volts. In any case the mains part of the wiring should be rated to carry at least the current that the standard mains fuse in the Leslie is rated at.

9-pin cables: The seven signal and control wires only handle low voltage and current, maximum 30 volts, current a small fraction of an amp. Very thin wire would be electrically OK, but mechanically fragile. The two mains wires (blue/grey pair) need to be insulated to your local mains voltage standard and carry the mains current for the Leslie. A minimum current rating of 2 amps would be adequate, but bear in mind voltage drop in long cables may make thicker wire advisable.

11-pin cables: All conductors are low voltage, low current. Maximum 30 volts. Really your only concern here would be mechanical robustness. You could even use a cable with fewer than 11 cores, one pin was specified for a variable speed control that Leslie never implemented, so only 10 cores are used in any Leslie, most use less.

I have from time to time looked for bulk cable that could be used to make up Leslie cables. Mostly what I've found with enough cores has been vehicle trailer cable which isn't rated for mains voltage. There is, of course, no problem, other than cost, to using cable with a higher voltage or current rating than necessary, or with more cores than needed.

Greetings -

Does anyone know what gauge wiring is/was used in the OEM Hammond Organ cables for Leslie and tone cabinets?? Are the voice channels the same gauge as the line voltage?

Your input would be greatly appreciated.

Stay home and safe,
Bob

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