TV 36 triax??   
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A strange connector, It was used by the BBC to augment the triax camera cable for power and addtional circuits. BBC report 1986.
It has:- 19 pins Plus one Co-ax and one triax

The PSF20/1M cable has
1 Co-ax cables
1 Triax cable
2 power circuits
2 shielded quads.
4 single conductors