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From July 1, 1966, the Aydas-9M reel tape recorder was produced by the Elfa Vilnius Radio Engineering Plant.
The tape recorder was created on the basis of the Aydas tape recorder and, as a predecessor, works from one engine of the KD-2 type.
Belt speed 9.53 cm / s, detonation coefficient 0.3%.
The tape recorder is designed for the use of coils No. 15 or 18, containing respectively 250 and 350 meters of type 6 magnetic tape. The duration of continuous recording in the first case is 2x45 minutes, in the second 2x60 minutes.
Sensitivity from the microphone is 3 mV, the pickup is 250 mV, the radio lines are 10 V. The voltage at the linear output is 250 mV.
The tape recorder records and reproduces the frequency range of sound on a linear output - 40 ... 14000 Hz, on its own loudspeaker 100 ... 10000 Hz.
The rated output power is 1 W, with a THD on the linear output of ~ 4%.
The dynamic range is 44 dB.
The recorder is powered by AC 220 or 127 V, consuming 80 watts of power.
The dimensions of the tape recorder are 400x300x185 mm and its weight is 12 kg.
The circuit of the tape recorder is printed.
In August 1967, the electrical circuit of the tape recorder was revised in connection with the requirement of the new GOST, respectively improved and at the same time significantly simplified.
The signal-to-noise ratio of the entire path is improved, the frequency range on the type 10 tape on the linear output is expanded to 30 ... 16000 Hz.
A loudspeaker 1GD-28 is installed in the speakers.
Design like the base model.
The first batch (~ 300 pcs) of Aydas-9M tape recorders was released in design and with the name Elfa-65.