Here is a fantastic site dedicated to television history as seen thru the eyes of the TV camera.

1000's of rare photos from the 1940's - 1960's. Including never before seen from the Jackie Gleason Show / Honeymooners.

Home page:
http://www.eyesofageneration.com/home.php

Dumont:
http://www.eyesofageneration.com/dumont.php

"What did Marconi invent?":
http://www.eyesofageneration.com/Marconi.php

Make sure to check out CAMERAS | GALLERY | ARCHIVES | COLLECTIONS | VIEWSEUM | LIBRARY for really historic photos.

Some more rare rehearsal photos below.
The 1st 2 are from "The Worry Wart."
The next 2 are from "Goodbye, Aunt Ethel".
The next 3 are from "Kramden Vs. Norton", "Song and Witty Sayings" & "Songwriters."

The 2 at the table above are from "The Deciding Vote" & "Two Below."

More rare rehearsal shots from uncertain episodes.
Also including a beautiful color shot of the Fab 4 on the bus in color.
Never seen this one in color before. It doesn't look colorized.