I just listened to a long intro about Welles' radio work which preceeded a rebroadcast of The Immortal Sherlock Holmes. It made some claims I've never heard before, so I thought I should try to verify them here.
One claim, which doesn't amount to much, is that Welles stopped doing The Campbell Playhouse in order to concentrate on his film commitments. I thought it was because he was fighting with Campbell's over what stories he could air. No biggie either way.
The big claim was that The Campbell Playhouse series continued without Welles for a season, directed by Zachary ____ (the audio skipped) and written by John Houseman and Wyllis Cooper. While no recordings survived, it featured episodes such as "Air Mail to Red Riding Hood" with Miriam Hopkins and Humphrey Bogart, "Kind Lady" with Gladys George and Herbert Marshall, and "My Client Curly" with Beatrice Kaye.
The speaker cites as his source Art Pierce.
Perhaps Campbell fired Welles and brought Houseman back, if this story is true. I'm sure Campbell sponsored other shows, but this source was claiming it was the same series, simply minus Welles. And if that's the case, it could have continued with the Mercury actors and still been broadcast from Hollywood. Or maybe it moved back to New York and had a different cast. Or maybe there was no such final series of the Campbell Playhouse.
Sto Pro Veritate