[JimSEA]

Hay, watch it! I can recall taking tubes to the hardware store and using their tube tester. You would buy a replacement for your bum tube and repair your radio or, later, your TV. Pitcher tubes were the olden times equivalent of today's blue screen of death.

[JimSEA]

Err. . . picture tubes Bad speller.

[Nik Naym]

“Pitcher tubes ...”

These were often used in push-pull arrangement with catcher tubes.

Supporting circuitry (AFC, sync, AGC etc.) was often designed using coach tubes, first baseman tubes and umpire tubes.

Less common were outfielder tubes used for tuned RF amps.