Miniature TV Tubes
![miniature-tv-tubes miniature tv tubes](https://www.innovation-creativity.com/wp-content/uploads/2019/07/miniature-tv-tubes.jpg)
Miniature TV tubes with a pilot at the base and at the socket would enable you to determine when to press them in safely. They’re devils when you can’t see their sockets – P. Legon, Malden, Mass
And then came the transistor, and printed circuits!
November 1963