TR-55 Radio Sony schematic

Posted on Feb 6, 2014

TR-55 was the first transistor radio produced and sold in Japan. It uses the following transistors: 2T51 (oscillator-mixer), 2 x 2T52 (for IF), 2T53 (AF driver) and 2T12. The very first commercially produced transistor radio was Regency TR-1 from October 1954 followed by Raytheon 8TP in spring 1955. GE has also built a pocket transistor radio in 1955 as models 675 to 678 depending color.

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The first SONY imported to the USA was TR-63 in 1957.

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