Eighty-five years ago, RCA reminded dealers of the importance of the RCA name when it came to tubes. Since the earliest days of radio, RCA had cranked out 35 million tubes, and the public trusted the name.  They were relied upon in industry, and by radio stations, both foreign and domestic.

If you were a dealer, would you want to take a chance on an off brand?  The ad appeared in the November 1938 issue of Radio Retailing.