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I just came into possession of a bunch of vintage "audio" gear from the nuclear labs at Los Alamos (a bunch of test oscillators, oscilloscopes, pulse generators, etc). Been checking it out, seeing what works, etc.

A lot of the stuff has a weird AC input that looks like the picture below. Any idea what this connector type is called, and where I might be able to find an adapter to a modern plug?

enter image description here

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  • \$\begingroup\$ An old "business machine" power cord connector? Looks like what was on the old electromechanical adding machines and typewriters. \$\endgroup\$
    – AlmostDone
    Commented Apr 27, 2018 at 2:48

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After some further research I've found out this connector is called a PH-163.

You can find them here: https://marvac.com/products/vintage-switchcraft-lac3gd-ph-163-oval-type-hp-connector-3-pin-round-ac3g

Adapters look like this: https://www.amazon.com/Vintage-Oval-Hewlett-Packard-Power/dp/B011CAFIGC

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