Fork vs. Sleeve Terminal Octal Sockets. - diyAudio
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Old 10th June 2009, 03:04 AM   #1
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Default Fork vs. Sleeve Terminal Octal Sockets.

The appears to be basically two types of octal sockets out in the new/nos world - sockets with fork connectors and ones with a sleeve connection - which is best? The fork sockets I have have fairly high insertion force, tending to indicate that they might hold on to tubes fairly well Do they keep that grip over multiple insertions? US nos vs. Russian NOS (both fork and sleeve types) vs new Chinese?
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Old 10th June 2009, 03:29 AM   #2
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I prefer the sleeve style sockets because the contact area is larger. But the fork type aren't too bad as long as they're NOS. And I only use NOS American. The Chicom stuff stinks. They soon loose their tension and grip. (Yet another example of a pretty copy with no substance.) Pay the extra dough for the good stuff. Tan mica filled for output tubes won't arc between pins easily from heat and age. And of course porcelain is great. I've no experience with the Rusky sockets, so I can't say.
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Old 10th June 2009, 04:01 AM   #3
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I use NOS Russian military ceramic sockets, but recently had to buy some Chinese sleeve porcelain types because they are only available 10 pin sockets for ECF200 tubes. They do not look as reliable.
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Old 10th June 2009, 11:01 AM   #4
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hey-Hey!!!,
I have had good results with the Russian forks...even on an amp where I was swappiing tubes frequently.

I am not at all sure the sleeve type offers any better contact; I suspect that they're also riding on a few points. It is unlikely that they'd form a large contact area.
cheers,
Douglas
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Old 10th June 2009, 11:28 AM   #5
vuohi is offline vuohi  Finland
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I've yet to break any of the cheapo fork type ceramic octal sockets I own. They do get a lot looser after you install and remove a valve a few times, though. I've got some sleeve type ceramic noval sockets as well, they do seem to hold the valve more firmly even after some use. Wow, now this post helped a lot, didn't it?

If I may, I'll ask if anyone has come across PCB mounted four pin sockets for 300Bs?
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Old 10th June 2009, 04:41 PM   #6
ChrisA is offline ChrisA  United States
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Default Re: Fork vs. Sleeve Terminal Octal Sockets.

Quote:
Originally posted by wrenchone
The appears to be basically two types of octal sockets out in the new/nos world - sockets with fork connectors and ones with a sleeve connection - which is best? The fork sockets I have have fairly high insertion force, tending to indicate that they might hold on to tubes fairly well Do they keep that grip over multiple insertions? US nos vs. Russian NOS (both fork and sleeve types) vs new Chinese?
My theory is that the forks have points inside that "dig in" with high force (as measured in pounds per square inch due to small surface area of the contact point) Is should make a gas tight seal from fork to pin tube. "gas tight" prevents corrosion of the contact area

Many guitar amps hang the tubes base up or horizontal and then put the amp in the same box as a speaker that is running at about a million decibles. The tubes seem to stay hanging in their sockets for years even when the equipment is moved on dollys down stairways. All of them I think use those old fork type sockets
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Old 10th June 2009, 04:44 PM   #7
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I have often wondered about this. it is hard to find new sleeve type sockets. and the ones you do find are generally pretty cheap quality. I wish someone was making NEW high quality yet affordable sockets! I need 50 of them for an OTL project!
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Old 10th June 2009, 08:11 PM   #8
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I like sleeves. It's easier to swap the tubes. The forks on the other hand sometimes work too well and make swapping tubes a real chore.
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Old 10th June 2009, 08:55 PM   #9
Colt45 is offline Colt45  Serbia
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mark me down for forks.
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Old 11th June 2009, 04:40 AM   #10
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I've built maybe 30 or so tube amps of all types and sizes and have been lucky enough to have on hand a few gallon ziploc bags full of vintage octal and minature sockets.

All types, brown phenolic ( sleeve-type), black plastic (fork-type) , and a few nice ceramic ones (fork-type). I like the brown sleeve type ,however if using them for something like a 5u4gb where you are only making 4 connections on the socket the tube can wobble. My only other complaint is that most if not all are bottom mount sockets, which makes it tough if you dont have the right size punch. Also, big base tubes like 6550 can hit screw heads preventing the tube from fully seating, So I've taken to using stainless rivets.

For the amps i build for myself i really like the pricy Belton fork-type, mica filled. I just love the look of them, and i've rolled countless tubes through them and they still grip well. Yes, they are expensive. So my vote is fork! or spork... well, if the tube fits...
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