[Arran]

It's funny...the 6T5 was the only bad tube. The rest are all good. Yes, most are metal; pardon me. I do not have a lot of ST style octal tubes and of the ones I do have, I'm saving them for use in my 1937-38 Philcos. Pin 1 of each socket is connected to chassis ground (I checked). So even though it doesn't look pretty by Brand Z standards, it is functional.

 Ron;
  I likely would have done the same, by the fact that Brand Z decided to ground pin #1 on each socket implies that, unlike Philco, they really had no objection to the idea of metal tubes being used as replacements in their sets. You could also have used GT style tubes if you really had to have glass, I can't recall whether this set still had the tube shields with it or not but by the looks of those clips you could use pretty much any style of octal tube you had on hand provided that the grid lead was long enough.
Regards
Arran