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In Reply to: RE: Socket Mounting posted by Triode_Kingdom on June 07, 2015 at 10:46:30
Hello,
The sockets were acquired by the initiator/prior owner of the project, and I don't have a clue as to the style/maker.... I have however attached a couple of pictures that will hopefully tell all!!
The upper surface, to which the 1/2" tube would butt, is indeed glazed. I put my small straight edge flat across the glazed base mounting hole, and it does look as though is pretty much perpendicular to the brass cylinder (excuse me for not knowing the proper terminology). I was planning on using a fibre washer (or felt) between the tube and the ceramic as well as the tube and bottom of plate (good buffer to prevent vibration and provides a bit of friction to keep the Al tube from rotating).
Regards -- Roger
Follow Ups:
Those are Chinese sockets, so I really don't know how well they'll work. Personally, I would toss 'em and hunt up some real EFJ made-in-USA sockets for a project like this. They're pretty common on eBay.
The other potential issue mounting this style socket with nothing underneath is the fact there are only two through-holes. That raises the possibility the sockets will rock and loosen over time. A company like Front Panel Express can probably cut round mounting plates to support the sockets from underneath. It would be worth sending them a sketch to find out.
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Buy Chinese. Bury freedom.
Hello,
I saw a National Co. socket that would work probably better than the Johnson, since the National is built to be undermounted. Any feedback on the relative quality of the two? Is the National a solid socket choice?
Regards -- Roger
The National socket that seems to offer better mounting has only lug connections, while the Johnson has lug and solder connections. Do solder connections offer better performance, or are the two connection methods pretty much a wash?
Thanks -- Roger
Can you post a picture? I don't recall ever seeing anything on these sockets except solder lugs. They're held in place with #10 screws through the ceramic base.
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Buy Chinese. Bury freedom.
Here is a picture. Looks like he only has one, so not really an option.....
I haven't used that type. I'm sure it's supposed to have solder lugs between the washers, they've just been removed. Incidentally, not all of these are for the same pinout. If you wire them as marked, and it turns out the G and P are swapped, you'll have trouble. Not really a problem as long as you know about it, but I'd prefer to have those markings in the correct locations if possible.
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Buy Chinese. Bury freedom.
Thanks very much for letting me know about the sockets - not good news, but better than after they were already in. I will indeed try and run down a pair of EF Johnson sockets. Of course, if these are Chinese, then the 6l6gc and 12au7 sockets are probably the same..... Is it fair to say that if there are no brand marks on the sockets they are Chinese?? As you might have already guess, I am anything but an expert on this.... I am looking to use good quality parts (within some reasonable budget) and put together a solid project. Lucky I am not in a rush !!!
Thanks and regards - Roger
I'm not sure all the US sockets will show a brand name. However, the pin contacts are formed differently than the ones you have, and no American manufacturer ever gold-plated their sockets. I just ran over to eBay, and all the US-made 211/845 sockets look old and tired at the moment. Be patient and you'll get a good pair, even if you have to buy them one at a time. Vintage octal and 9-pin sockets are easier to find, although they frequently sell for more than I think they're worth. Belton sockets have also been recommended by Jim McShane as a good modern replacement for octals and miniatures.
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Buy Chinese. Bury freedom.
~!
The Mind has No Firewall~ U.S. Army War College.
Just to confirm, are you sure it wasn't done after the fact by someone else? I'm also curious how tubes this large (i.e. slow) would be used in radar. Do you have any more info on the origin or use of those sockets (I didn't see your previous post)?
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Buy Chinese. Bury freedom.
Edits: 06/12/15
Here is the link from AA forum... The British invented RADAR and as you know... the lower the frequency the farther the range... a triode would be more than sufficient, the antennae plays just as big a part as it should match the frequency being beamed, moreover the technology progressed to the cavity magnetron, the beginning of fast food via microwave.
As an aside, {as I have learned} a 6SJ7 may be electrically very similar to a 77 or 6C6... the fact remains, aurally the 6C6 will soundly trounce the 6SJ7... pun intended. As usual, more is going on than just reading by the numbers. Size of the plate for older tubes making a difference?
Perhaps.
The Mind has No Firewall~ U.S. Army War College.
Edits: 06/24/15 06/24/15
Thanks for your help in this. I am fine with patience - for some reason I have a strong aversion to Chinese products, so any inclusion would be from ignorance rather than intent. There are some nice NOS vintage sockets out there, and the prices are higher but not prohibitive. Any particular brands I should look for or avoid. I think I am going to stick to ceramic.
Thanks -- Roger
Some users have reported odd noises or susceptibility to vibration associated with ceramic sockets (octals and miniatures). I can't confirm that, but almost all my vintage sockets are bakelite or similar. The only exceptions are ceramic octals that I use for high voltage applications (more than +750V). Good luck with your project!
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Buy Chinese. Bury freedom.
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