[Radioroslyn]

Pardon for asking a question but why would you want to do that?? Generally speaking unless the sockets are badly damaged it's not a great idea to do it on a whim. Sometimes you can have sockets that are burned from the heat/contact from the glass part of the tube but most of the time that happens with miniature tubes like the 50B/C5's and 35W4's not octal or loctals. Or arcing from contact to contact which burns the wafer. Just did one on my 660L, one of the 42 tube had been arcing and burn a carbon trace into the 6 pin socket. Or physical damage.
As you are finding (or not) loctal sockets are getting a bit harder to find these days. If I HAD to replace a loctal tube I would use the octal equivalent and use octal socket. Loctal are a bit of a pain.

GL
Terry