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Since 1966, the Tallinn-4 "Estonian-4" lamp network has been produced by the Tallinn Punane RET plant. Radiola top class "Estonia-4" was created on the basis of the previous model "Estonia-3M". The new radiol has some fundamental and structural differences, which can be read in the description above, the basic construction of the electrical circuit and the parameters of the radiol are the same. The export version of the radio range was produced with the name "Estonia-4E" ("E" is the European version), the models differed in wave bands. Technical characteristics of the radiograms: Number of ranges - 8. Sensitivity in the ranges of DW, CB and HF - 50 µV, on VHF - 5 µV. The adjacent channel selectivity in AM is 60 dB, FM is 40 dB. The intermediate frequency in AM is 465 kHz, FM is 8.4 mHz. Band of reproducible sound frequencies 60 ... 15000 Hz. The number of radio tubes in the radio is 12. The output nominal power of the low-frequency amplifier is 6 W, the maximum 9 W. The power consumption when receiving radio stations is 95 W, while listening to the recording of 105 W. The dimensions of the Estonia-4 radio are 915x316x362 mm, AC ~ 915x350x400 mm. The total mass of the radio with speakers is 60.9 kg.