RCA Radiotron Vacuum Tube 1927 Ad
RCA Radiotron Vacuum Tube 1927 Ad. This black, white and red October, 1927 ad states Radio set manufacturers recognize the vital importance of the vacuum tube. That is why the leading makers of sets sold on a quality basis use Radiotrons throughout and specify them for replacement. Picture shows radio service man checking Tubes on Tube Checker. Magazine tear sheet picture is taken through plastic and may show wrinkles or crookedness that is not In the ad. This original magazine tear sheet measures 10 1/4 inches wide by 13 3/4 inches tall.
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