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Some variants of the plug, especially cheaper versions, also give very poor grip and contact between the ground sheaths due to their lack of spring action.
RCA Victor Service Data Volume II: 1938-1942: Radio Receivers, Phonographs, and Television (PDF) (1sted. A true balanced connection is generally preferred in certain applications, particularly professional settings because it allows for the use of long cables while reducing susceptibility to external noise. Its use as a connector for composite video signals is extremely common but provides poor impedance matching.The connector was labeled on the back of radio with one of the following terms: " Victrola", " Phono", "Pick-up", "Television". The RCA connector [3] is a type of electrical connector commonly used to carry audio and video signals. They are often color-coded, yellow for composite video, red for the right audio channel, and white or black for the left channel of stereo audio. Even the simple case of attaching a cassette deck may need four of them–two for stereo input and two for stereo output.
The name RCA derives from the company Radio Corporation of America, which introduced the design in the 1930s. RCA connectors and cable are also commonly used to carry S/PDIF-formatted digital audio, with plugs colored orange to differentiate them from other typical connections. 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.Models TRK-9, TRK-12, TRK-90, and TRK-120: AC, Superheterodyne, High-Picture-Definition, Five-Television-Channel, Receiver and Three-Band, Electric Tuning, AC, Superheterodyne Broadcast Receiver". audio, the standard has degraded to a more general white/yellow, red/blue, and green/yellow color scheme for each cable respectively. Cables should meet the S/PDIF specification as defined by the international standard IEC 60958-3 for assured performance. citation needed] History [ edit ] Rear panel of a 1939 RCA model 45EM vacuum tube desktop AM radio with a female RCA jack. Improved Electric Tuning For All Is Keystone of New RCA Victor Standard Line of Domestic Models" (PDF).