In the U-109, the internal amplifier chassis had female connectors which accepted male cables from the internal radio chassis and built-in phonograph player. In 1937, it was used inside a RCA model U-109 radio- phonograph and model R-97 phonograph.
The following dates were derived from historical RCA documentation.īy no later than 1937, RCA introduced this connector. The exact release date of this connector is still a little vague. Tag reads "An inexpensive RCA Victor record player will make a fine Victrola of this radio. History Rear panel of a 1939 RCA model 45EM vacuum tube desktop AM radio with a female RCA jack. RCA jacks are often used in phono inputs, a set of input jacks usually located on the rear panel of a preamp, mixer or amplifier, especially on early radio sets, to which a phonograph or turntable is attached. The word phono in phono connector is an abbreviation of the word phonograph, because this connector was originally created to allow the connection of a phonograph turntable to a radio receiver. It is also called RCA phono connector or phono connector.
The connectors male plug and female jack are called RCA plug and RCA jack. The name RCA derives from the company Radio Corporation of America, which introduced the design in the 1930s. The RCA connector is a type of electrical connector commonly used to carry audio and video signals. RCA plugs for composite video (yellow) and stereo audio (white and red)
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