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Pins and Sockets

Here are a couple of points with pictures that may help.

1st picture is of a Belton 9-pin tube socket. Extremely tight fitting such that you literally have to ease the tube in slowly and using a rocking motion.

2nd picture. As tight as the Belton's are, I still tighten them on occasion with a dental pick to ensure they are as tight as can be. Different pin sizes, as you may be experiencing, will enlarge them. Then when swapping in a tube with slightly thinner pins, contact will be weaker. I have found pin thickness discrepancies even of tubes manufactured in same plant. Though the date codes are often different. Both in 9 and 8 pin tubes.

3rd picture. Note that contact on the pin and socket can be at different points. Those contact points are the key areas of concern. Usually about a third of the way down. You can actually see a slightly darker area on the pins in the picture as to where they begin to engage and end up making contact.

4th picture. If you really want to clean those tube sockets, I find dental paper points to work best. I can actually "see" the dirt come off when I clean with the paper points and a contact cleaner. I've used a tube socket brush before, but I just don't know if nylon bristles are actually scrubbing.

5th picture is of the dental paper points that I buy. I usually watch for sales on eBay and stock up. Sometimes they come in variety packs. Sometimes you can just get the thicker ones. I believe I have enough to last a decade or two.

Note that the socket cleaning should be done before tightening. Sorry this is out of order, but I'm too far into writing this to start over.

Hope some of this helps!



"I know just enough to get into trouble. But not enough to get out of it."

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  • Pins and Sockets - Jonesy 15:19:49 06/29/20 (0)


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