Yes,

I have been looking into tubes lately and it is not only tricky to source them for the larger IMAC or F3A models but if you want tubes that are for a smaller project, the pickings become very slim. 7/16" seems to be the lower end of tube sizes both Gator and PBG.

I don't know how the quality of the TNT tubes and sockets compare to PBG but it may well be that they are the best source in town - assuming that they do have what they advertise on their site.

Thanks for the info.

David.