Collets for 212 pins

mobyd · 21st April 2006, 10:58 AM

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 ?
M

CV · 13th May 2010, 11:45 AM

Billington export in the UK may have sockets....

HollowState · 13th May 2010, 04:45 PM

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.

HollowState · 13th May 2010, 04:57 PM

Forgot to add this pix.

astouffer · 13th May 2010, 09:23 PM

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.

21st April 2006, 10:58 AM	#1
mobyd diyAudio Member Join Date: Sep 2004 Location: Auckland	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 ? M

13th May 2010, 04:45 PM	#3
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	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. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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13th May 2010, 11:45 AM	#2
CV diyAudio Member Join Date: Nov 2002 Location: UK	Billington export in the UK may have sockets....

13th May 2010, 09:23 PM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	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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