![]() ![]() Other experimental circuits of the time, as well as the upcoming transistor receivers from 1955 below, deviate from its circuit design significantly.A great similarity is apparent when comparing the circuit of the "Telefunken TR-1" with the "Regency TR-1" (Fig. The circuit of the self-oscillating mixer stage, the base bias voltage of the second IF stage from the AF power stage, the unusual IF of 262KHz and the supply voltage of 22.5 V are all characteristic of the device. It was a true international sensation (2).The circuitry of the Regency shows some peculiarities. It was the first mass-produced transistor receiver in the world and arrived earlier than the professional world expected. In the USA on the 18th October 1954, the "Regency TR-1," developed by Texas Instruments was launched on the market. Here we add the following commentary to the article "Telefunken Pocket Radios from 1955-1960" in Funkgeschichte Nr. Translated from: Gebert W Anmerkungen zu den Schaltungen der ersten Transistorradios Funkgeschichte 115 (1997) 241-44 by W Gebert and M Burgess from Sony Corporation TokyoĬomments on the Circuits of the first Transistor Radios In French: TSF for Télégraphie sans fil.Īll listed radios etc. Here you find 3854 models, 3719 with images and 860 with schematics for wireless sets etc. See "Data change" for further contributors. The first SONY imported to the USA was TR-63 in 1957. GE has also built a pocket transistor radio in 1955 as models 675 to 678 depending color. The very first commercially produced transistor radio was Regency TR-1 from October 1954 followed by Raytheon 8TP in spring 1955. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver) and 2T12. TR-55 was the first transistor radio produced and sold in Japan. TR-55 is a superheterodyne and can also be used with earphone. This model, TR-55 (TR 55, TR55) has then been produced as the first SONY Transistor Radio for sales in August 1955. In April 1955 SONY has built a prototype of it's first Transistor Radio, the TR-52, looking like United Nations Building - but TR52 was never really released because of the front-plate "ungluing". Very small Portable or Pocket-Set (Handheld) Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2.5 inch = 6.4 cm. ![]() Superheterodyne (common) 2 AF stage(s). ![]()
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