Just putting this out there.
I just wanted to show the size differences between some of the more popular that I have. The Tung Sol KT150 is huge. I thought the Tung Sol KT120 was large when I first got it then saw the stout 6C33C-B power tube. I don't have any 6L6, EL84 or 300B type power tubes to compare though so I know this line-up is missing some competitors.
I was inspired the DVD cover to the Usual Suspects.
Enjoy. From left to right.
GE JAN 6550 JJ KT88 Blue Glass, Tung Sol KT120, Tung Sol KT150 and 6C33C-B power tube.