"Selga" ( Latvian Selga - open sea) is a brand of portable transistor radio receivers popular in the USSR , manufactured at the Riga A. Popov Radio Plant and the Kandava Radio Plant from 1963 to the mid-1980s.
All models under the Selga brand are battery-powered superheterodynes for receiving transmissions with amplitude modulation in the long and medium wave ranges , with an internal magnetic antenna on a ferrite rod, with a standard intermediate frequency of 465 kHz.
Selga-402 (1970) - the first Soviet silicon transistor household receiver.
The design of the first three models (Selga, Selga-402, Selga-403) was developed by the famous Latvian designer and designer Adolf Irbitis .
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Lineup
Selga
The class IV receiver has been produced since 1963 to replace the Gauja receiver, the first transistor receiver of the plant named after Popova. The circuit is based on seven germanium transistors, powered by a 9-volt Krona battery or a rechargeable battery, rated output power is 100 mW. Efficiency is maintained when the supply voltage is reduced to 5.6 V. The operating time at an average volume of “Krona” is 20-25 hours. Dimensions 170 × 99 × 40 mm, weight 480 g. The price with “Krona” is 34 rubles , with a 7D-0.1 battery and a charger - 43 rubles.
“Selga” was produced in buildings of different colors, in several versions of external design, including “anniversary” ones - to the 25th anniversary of the Latvian SSR, to the 50th anniversary of Soviet power and to the 100th anniversary of V. I. Lenin. Export receivers were sold under other names, for example, the Convair 700.
Selga-402
The 1970 model was originally called Selga-2. It differs from the first Selga in its external design and significantly changed circuitry. Silicon transistors KT315 series are used in the high and intermediate frequency path, otherwise the IF filter and the IF amplifier are solved. It was indicated that these changes to the circuit will allow it to be transferred to hybrid microcircuits in the future. [1] The specifications remain the same, the cases and boards of the first and second models are completely interchangeable.
Selga-403
This model was announced in 1971, but, apparently, it was not mass-produced. The receiver is assembled on three transistors and one integrated circuit K2ZHA421 ("Rhythm-2"). [2] This hybrid microcircuit is mentioned only in connection with the Selga-403, and also, most likely, existed only in prototypes. The output power of the receiver is increased to 220 mW. Powered by six elements 316 . The dimensions of the receiver are 195 × 95 × 50 mm, weight 650 g. The design is very different from the first models - a round dial is introduced instead of a linear one. Instead of the 403rd model, the 404th was soon put on the conveyor - on conventional transistors. In total, 273 radios were produced, after which it was removed from the conveyor and the release of the Selga 402 receiver was continued.
Selga-404, Selga-405
In 1973, the “404” model appeared, which differed from the “402” in increased output power, improved sensitivity and selectivity, a modified IF filter, a new loudspeaker and a new design housing. In 1977, the exterior decoration was slightly changed and the receiver was renamed “Selgu-405”. Powered by Krona or 316 elements, dimensions 190 × 100 × 46 mm, weight 0.7 kg. Price - 32 rubles. 67 kopecks Models "404" and "405" were produced in very large quantities ("405" from 1977 to 1985 - more than 7 million pieces [3] ).
Selga-410, Selga-309, Selga-310
“Selga-410” is a completely new receiver based on the K174XA10 multifunctional chip and one field-effect transistor , developed at the RRZ in 1983 and released by the experimental series. Mass production began in 1985 in Kandava already under the name “Selga-309” (according to the standard GOST 5651-82 that came into force, this receiver was no longer in the 4th class, but in the 3rd complexity group, which was reflected in the index ) There was a variant of this receiver on discrete transistors, apparently due to a shortage of microcircuits. [4] Maximum output power of 150 mW. The dimensions of the receiver are 74 × 158 × 37 mm, the mass with batteries is 340 g. Power is supplied from three elements 316 with a total voltage of 4.5 V. The retail price is 29 rubles.
There is a photo of the Selga-310 receiver, which differs from the 309 by the shape of the case and scale, but there is no data on its mass production. [5] Since 1986, the Kandava plant has been manufacturing the Imula RP-8310 receiver, which differs from the Selgi-309 on the microcircuit only in its case design. [6] The export version of Imula is known as Selga R-8310 [7]
Notes
- ↑ Izak Yu., Sermulis A. Radio “Selga-402.” // Radio, 1970, No. 12, p. 15 (inaccessible link) . Date of treatment June 13, 2012. Archived October 27, 2012.
- ↑ Schematic diagram of "Selgi-403" and a description of the IS K2ZHA421
- ↑ Selga 405
- ↑ Selga 309
- ↑ Radiotehnika Selga-310
- ↑ Radio "Imula RP-8310" (inaccessible link) . Date of treatment June 13, 2012. Archived May 12, 2012.
- ↑ Selga AM 2-Band Radio Receiver R-8310
Literature
- Golubev Yu. Radio Selga. // Radio, No. 10, 1964, p. 30 and tab
- Belov I.F., Dryzgo E.V. Handbook of transistor radios. Part 1. - M .: Soviet Radio, 1973
- Novoselov L. Ye. Pocket transistor receivers of the IV class. - L.: Energy, 1973