A couple of good reference sites

[KJ6BSO]

For those of us who like radios that glow in the dark:

http://www.kbapps.com/tubemanual.html (the old RCA Receiving Tube Manual online)

http://www.nj7p.org/Tube4.php (good substitution data, more easily accessible than the above)

[N8YX]

This deserves a sticky.

[ad4mg]

It's stuck!

[KJ6BSO]

It's stuck!

Ewww, gross! :mrgreen: