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Old 21st April 2006, 11:58 AM   #1
mobyd is offline mobyd  New Zealand
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Default Collets for 212 pins

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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Old 13th May 2010, 12:45 PM   #2
CV is offline CV
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Billington export in the UK may have sockets....
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Old 13th May 2010, 05:45 PM   #3
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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.
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Old 13th May 2010, 05:57 PM   #4
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Old 13th May 2010, 10:23 PM   #5
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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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