Transistor network electrophones "Accord-Stereo" (IIEF-71C) and "Accord-Stereo-2" since 1970 and 1975, respectively, were produced by the Riga EMZ.
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Electrophones are developed on the basis of the "Accord" model and are designed to play mono and stereo phonograph records of all formats, and also allow you to broadcast programs from a receiver and tape recorder with speakers of inferior quality.
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The EF has smooth control of timbres for bass and treble, stereo balance, a jack for connecting a tape recorder and another source of programs when used as an amplifier, and a jack for connecting a radio transmission line.
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The nominal output power of each amplifier channel is 3 W with a THD of 2%.
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Maximum output power 6 watts.
,86e6f450b8cc469628ba70bf2947b049
Sound frequency band but sound pressure 80 ... 12000 Hz, with a total uneven frequency response of 14 dB.
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The average acoustic sound pressure of the channel is 1.2 N / m2.
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The sensitivity from the EPU and the tape recorder is 200 mV, from the radio line 12 V. The limits of adjusting the low frequencies at a frequency of 100 Hz 16 ... 23 dB, high frequencies at a frequency of 10000 Hz - 4 ... 17 dB, stereo balance 10 dB.
,86e6f450b8cc469628ba70bf2947b049
The background level from the input of the amplifying path is -52 dB, for the entire path -46 dB.
,86e6f450b8cc469628ba70bf2947b049
The microphone is powered by an alternating current with a voltage of 110, 127 or 220 V (50 Hz).
,86e6f450b8cc469628ba70bf2947b049
Power consumption when playing records 40 W.
,86e6f450b8cc469628ba70bf2947b049
The dimensions of the microphone are 158x392x315 mm, for one speaker 270x363x122 mm.
,86e6f450b8cc469628ba70bf2947b049
EF weight 13.5 kg.
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To expand the names of products in 1975, together with the release of the "Accord-Stereo" electrophone, the plant produced the "Accord-Stereo-2" electrophone, which differed little from the base one.
,86e6f450b8cc469628ba70bf2947b049
Three and four-speed EPUs were installed in the electrophones.
,86e6f450b8cc469628ba70bf2947b049
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