Bill W. one of the founders of AA speaking (in 1966) on the topic of the Spiritual Experience -- A Matter of Grace. 
This had a nasty bit of a hissing in the background but I was able to get the majority of it out, its quite listenable for an older recording, it ends abruptly during the Q&A.
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Sober Cast: An (unofficial) Alcoholics Anonymous Podcast AA

Topic: The Spiritual Experience -- Bill W

An AA meeting in a Podcast. Sober Cast is an (unofficial) Alcoholics Anonymous podcast featuring AA speaker meetings and workshops. This is not a discussion podcast, simply speaker meetings and workshops in a podcast format.