[Arran]

I know what you mean, I have a handful of those test adapters, one or more for octal, one for 7 pin miniature, one for 9 pin miniature, and I think either a 6 or 7 pin UV based style, but not a loctal one. You may have to get a real loctal socket pulled from a junk chassis for at least half of this, that or figure out the octal or seven or nine pin mini equivalent of the tube used, if there is one. I was scratching my head about why someone would substitute the original U.S made sockets for those ones you bought, but someone on here did, I've never had any serious problems with molded Bakelite loctal sockets, I have with the wafer ones at times though, clean contacts in the sockets are everything, many have such a small contact area to grab the pins compared to octals and the old style tubes. Wafer sockets are iffy even on octals, and some are just complete junk. Brand Z and G.E like loctals for a time too, so you don't necessarily have to grab a Philco chassis to get spares.
Regards
Arran.