You need a tube tester with 4 & 5 pin sockets. Some of the later ones don't have these sockets.
Yes, these tubes are still available. Check AES at tubesandmore.com . Their prices may be high but the tubes will be listed. There are other selling tubes.
Norm
: Can anyone tell me what kind of tester I should be looking for to test tubes from an old 1929 Majestic Console Radio. This set contains tubes T-27's, a few 45's and a Cunningham 380. Do these tubes still exist or have they been replaced. Appreciate all the help I can get Thanks Bill