I'm guessing that it's the same connector as was used on the R107 receiver for AC Mains input. (Also the RF Amplifier No.2 for he WS19, though in that case for 12V, and was also used on some test equipment for inserting an ammeter to measure the supply current.)
If so, they should be easier to come by than the "domino" connectors as they were still in use in the 1960s!
Chris.
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