Radio News Sylvania Ad, September, 1947

During 1947, Sylvania ran a series of colorful ads on the back cover of Radio News magazine, touting their "Lock-In" tube sockets. This ad explains why the lock-in tube socket was especially effective for FM receivers. Other ads in the series described why lock-in tubes were at home on the rails (railroads), in the air, on the sea, on the road, in television equipment, and so on. The first ad in this series was published in February, 1947.

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