The old 212 project is nagging at me again, and of course the only thing harder to find than 212s is sockets for 212s. I'm thinking of mounting them on a thick acrylic sheet with collets on the pins (like in collet knobs) after all I don't plan on removing them that often. Q: anyone know where to find 3/8" brass collets ?
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The pin diameter on a WE-212 is 3/8 inch (.375). The pin diameter on certain Eimac tubes like the 4-1000A & 3-1000Z are also 3/8 inch. So, if you can find a used Eimac SK-500 air socket (eBay), you will have the perfect collets you need. They can easily be removed and remounted to match the 212 pattern. I would use a better material for the base like phenolic, glass-filled delrin or G-10 grade garolite. Remember to leave the collets mounted slightly loose to wobble , as they are on the SK-500 socket, so as not to stress the tube base.
AudioXpress had an article a few years ago about making homebrew tube sockets. Find a piece of copper or brass tubing that fits over the pins, mill a flat spot and attach a piece of flat springy metal to maintain pressure. Gotta agree with HollowState on the choice of base material. Acrylic and heat are not a good match.
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