[Hallicrafters] Definition of a tube?

[Zengmeiste at aol.com]

>Another definition of a tube is "Light Emitting Glass Enclosed Field Effect 
Transistor." - Mike, WA4DLF<

OK, so now I'm confuseled. 

If a tube is a field-effect device, then pray tell how the heck 
do you explain that they work pretty well aWAY from fields, *inside* the 
house?
How can being in a field make something work?
Besides tractors, I mean?

There's just SO much to learn about electronical stuff, it's amazing!

73
Terry, no call