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The tape recorders Astra MK-111S and Astra MK-111S-1 were produced by the Leningrad Tekhpribor factory from the beginning of 1989 and 1991.
In 1989, the first batch of reel tape recorders of the first complexity group Astra MK-111S was released at the Tekhpribor factory.
The tape recorder is distinguished by very high technical indicators, the presence of a PA with a maximum power of 25 W, an integrated broadband speaker with a power of 4 W, low weight.
The control stick of the LPM is replaced by an electronic-logical control system, with the possibility of choosing the operating mode of the device in any sequence, and the dial indicator of the recording level and the mechanical tape flow meter are replaced by an electronic display unit.
However, tape recorders with arrow indicators were also produced.
Magnetic heads have a resource of up to 5000 hours.
UM is modified taking into account the increase in power with electronic protection.
Magnetization system with automatic and direct regulation of the bias current.
Belt speed: 19.05 and 9.53 cm / sec.
Detonation ± 0.08 and ± 0.15%.
Frequency range 25 ... 28000 and 31.5 ... 18000 Hz.
Weighted signal-to-noise ratio 60;
54 dB
Power consumption 50 ... 180 watts.
The maximum output power to the built-in and external speakers is 2x8 and 2x60 watts.
Dimensions of the model - 463x414x170.
Weight is 16.5 kg.
Since 1991, the plant has been manufacturing the Astra MK-111S-1S tape recorder in terms of design and parameters, which is almost the same as the base model, but with a revised electrical circuit and, accordingly, changes in the installation of the model.