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Hi Jeff,

I always wondered what the Tek PCB sockets were filled with and was that stuff really necessary?

The Tek PCB sockets are really great. I wish there was someone selling something like them now. I didn't find any other manufacturers of PCB pin sockets other than Milli-Max. Maybe someone else can locate a company that makes the kind that have a filler in them and explain how the filler helps the socket make better contact.

I always wondered how a wire was able to make contact with the inside of the Tek PCB sockets since the filler material (whatever it is) may get in the way of making contact to the socket.
I haven't tried to see if the filler material is conductive but I always assumed it isn't conductive at all.

If I remember correctly the Milli-Max pins I used have three spring fingers that press inward inside the socket where they grip the wires of the part. I like that idea because it tells me these sockets have the greatest area in contact with the wire.

40 years ago I worked for a company that used pins similar to the ones Tek used. They were filled with a similar material. They came on a flexible 1/4" mylar ribbon for automatic insertion into a PCB. These were square unlike the Tek ones which are round. These also required a 40% bigger hole in the PCB partially (a drawback) because they were square.

Dennis Tillman W7pF