Those look to be 10-pin
Cinch-Jones connectors, likely part of an analog dimming
system. If you want to use a modern
desk, you'll need a DMX-Analog converter (or several) as well as the proper
adapter(s). I'll bet someone else will be along shortly to give way more information than I ever could.
@VictorG Exactly as
@Les posted and adding the following:
Cinch Jones 300 series, based upon the apparent pin size and
current rating. [Their 500 series were appreciably larger.] Their part number would involve 310 plus a 2 or 3 letter alpha code ahead of 310 denoting their mounting style, in the sense of
panel mount, as in your photo, or cable ends. From memory, a
CCT310 would be a 310 series
connector with the
Cable
Clamp on
Top whereas a
CCE310 would be the same contact
block supplied with a back shell with the
Cable
Clamp
in one End. When you assembled the insert into the shell, you could orient it either way depending upon which way you wanted the cable to enter from. The actual contact blocks / inserts were inter-changeable between housings with cable housings designed with cable entries and clamps on the end, 90 degree, or on the top / rear. Of course they were all available in males and females, possibly designated with a simple F or M appended to the end of the part number. From memory, the 300 series ranged from 2 to 36 contacts with a longer, more robust, round contact included on larger sizes to aid in mating and alignment. Don't hold me to it but I think the longer round contact was included in the 24 contact , and larger, sizes. The little 2 contact was the only round
connector with the 4 contact being square. The others, from 3 to 36, were rectangular. One nice feature, from the
point of view of maintenance, on most of the males in the series, you could remove and replace a damaged contact if desired rather than having to remove and replace an an entire multi-contact
connector. The exposed male contacts were more prone to bending and damage than their female mates.
Not carved in stone but a typical analog pin out could be:
Contacts 1 through 6 or 8 equaling 0 to 10 volts DC controlling dimmers 1 through 6 or 8 with common on contact 10.
Polarity could be either positive or negative common depending upon the manufacturer of your dimmers. Many manufacturers employed zero to ten volt DC analog control in the days prior to AMX-192, DMX-512A and other multiplexed protocols such as
Colortran.
Cinch Jones multi-pin connectors, and an intermateable compatible brand should still be available today from suppliers such as Mouser.
Cinch Jones used metal back shells with paper or plastic
insulator linings. An alternate brand used plastic back shells and was popular in the vending machine industry.
EDIT 1: Corrected a typo. I had spelled "with" as "withe". With apologies for my blunders.
EDIT 2: Corrected largest size from 37 contacts to 36.
Toodleoo!
Ron Hebbard.