@Wisedly -- Well, that explains a lot. My friend's dad is an antique radio buff, and has griped about having a hard time finding tubes for the old sets. Now I know why.
We bought a TV in the very early 70s that was mostly tube-powered. When you turned it on, you had to wait a minute or two for it to warm up before you got a picture. The audio usually came up first. Then, it might be another couple of minutes before the picture looked right. This process took even longer for a color TV.