I don't know if this is old news, but I found this interesting site with photos of the "CBS Radio Playhouse" on Vine St. in Hollywood, (and other studios)
http://www.hollywoodphotographs.com/sea ... 5&offset=8
The theater has had several name changes over the decades. I had always known it as the "Huntington Hartford Theater." But I didn't know it was a radio studio in the old days. Were any of the radio shows broadcast from there?
There are links to photos of other locations on the left side of the page. On page 25 of the "Restaurants/Nightclubs" link there is a picture of Jack (although I wouldn't recognize him from the picture) at Ciro's nightclub with Robert Taylor and Barbara Stanwick. The main addy of the site is:
http://www.hollywoodphotographs.com