Capitol originally recorded at Radio Recorders and I believe the Bing Crosby shows were also taped there. When Capitol bought their own studio it was staffed mostly with people from Radio.
(Pre-recording radio shows was their original business, hence the name.)
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From Tom Fine:
...Capitol and Mercury started doing most recording onto tape in the 1948 timeframe. Capitol was one of the first customers for the Ampex 200 and later 300 model tape machines, at their studio in California (I don't think they had their own studio in NYC in those days). Mercury used three early adopters of tape recorders for much of their recording in the late 40's -- Radio Recorders in Hollywood, Universal Recording (Bill Putnam) in Chicago and Reeves Studios in NYC. Reeves was fully equipped to do both tape and disk recording in 1948, as detailed in a series of articles in one of the magazines of the day, reprinted by Fairchild (the main supplier of recording equipment to Reeves at that time)...