Not much into Youtube, but recently have discovered there are some real old nostalgic episodes (late 40's, early 50's) out there to be found:
- Perry Mason with Raymond Burr
- Abbott and Costello sketches
- Jack Benny sketches
- 1940s Superman cartoons
- Lone Ranger with Clayton Moore (the best IMO)
- Have Gun Will Travel with Richard Boone
Any more you like?