He did a lots of radio. You can find a list of his radio broadcasts at http://www.tyrone-power.com/radio.html
A lot of this is available online or from classic radio retailers like Radio Spirits. I like listening to the Lux Radio Theatre broadcasts on the computer. :)
Great find, Peachtree!! He *did* have a magnificent voice! (I recall reading at one point that he was slated to star with Ingrid Bergman on the stage in '59. Can you imagine what that would have been like!)