ZX81 denigrated! (was Re: Approaches to projects)

Now, this nect bit is very off-topic, but.... I've got a older Philips Reel-to_-Reel recoerder with a strange socket for the record player input. According to my shelf of schematics for such things, several other Philips-made tape recorders (sold also under the Cossor and Stella names had this connecotr, either on its own, or with a normal DIN socket wired in parallel. The connector has 5 flat pins in a line, arranged something like : | -- -- | -- There is no overall screening can. The pins are named p, q, r, s, t, every alternate pin is chassis ground, the other 2 being the 2 audio channels. According to the service manual for my machine, it's called an 'IEC socket' and I have the Philips part number for the socket and the mating plug. What I can't find, though, is any reference to the plug ever having been used. I can't find any mention of a record player fitted with said plug on the pickup cable. Has anyone ever come across it.