Two Classic SciFi radio dramas can be downloaded from the Internet Archive:

Dimension X was first heard on NBC April 8, 1950, and ran until September 29, 1951. This show dramatized the work of such young writers as Ray Bradbury, Robert (Psycho) Bloch, Robert Heinlein, Isaac Asimov, and Kurt Vonnegut. In-house script writer was Ernest Kinoy, who adapted the master works and contributed occasional storied of his own.

X Minus One aired on NBC from 24 April 55 until 9 January 58 for a total of 124 episodes with one pilot or audition story. There was a revival of the series in 1973 when radio was attempting to bring back radio drama and it lasted until 1975. The show occupied numerous time slots through out its run in the 50's and thus was never able to generate a large following.

X Minus One was an extension of Dimension X. The stories for the show came from two of the most popular science fiction magazines at the time; Astounding and Galaxy. These stories came from the minds of Ray Bradbury, Isaac Asimov, and Poul Anderson to name a few.

Dimension X

• 50 episodes
• List of episodes at wikipedia.org
• Dowload all episodes at archive.org

X Minus One

• 127 episodes
• List of episodes at wikipedia.org
• Dowload all episodes at archive.org