Re: Coultant power supply connections ?
I suspect that the Yellow & Black sockets are just monitoring points for the 2 supply rails.
Why do you think there should be a 5v rail?
Some of these Coutant supplies also had remote sensing terminals but this one does not.
Most of these were 1 or 2 rail systems ranging from 1 to 10 amps capacity with series regulators.
Popular in the early sixties and used widely in the computer industry.
Orakle42
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