Portable radio `` Sony TR-55 ''.
Portable radios and receivers.ForeignThe Sony TR-55 portable radio has been produced since August 1955 by Tokyo Tsushin Kogyo, later Sony. AM range - 535 ... 1605 kHz. Sensitivity ~ 2 mV / m. The output stage of the LF amplifier is single-ended. Maximum output power 25 mW. Power supply - 4 AA elements (1.5 x 4 = 6 volts). The range of reproducible sound frequencies is 250 ... 3500 Hz. Dimensions of the model are 140x89x38 mm. Weight 560 grams. The first prototypes of the radio since the fall of 1954 were referred to as "Sony TR-5" in terms of the number of transistors, later since 1955 "Sony TR-52" in terms of the number of transistors (5) and semiconductor diodes (2). The serial model "Sony TR-55" was named after the year of release (1955).
