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Since the fall of 1954, the tape prefix "Wave" has been manufactured by the Moscow plant "Detail". The "Wave" tape recorder combined in itself the simplicity of the design and the electrical circuit, had a number of advantages and disadvantages. The prefix did not have an electric motor, an EPU drive of the device was used here, with which the prefix was operated. The model circuit contained one radio tube that served as a generator for erasing and biasing, a corrective recording amplifier, and a preamplifier. All other functions were performed by the base unit (a household radio receiver or a low-frequency amplifier) "‹"‹to which the set-top box was connected via a special plug. Such a plug could be installed on the device itself, it was attached to the set-top box, and some serial devices already had similar plugs, for example, Estonia-55 radio, Kazan, etc. Two-track magnetic tape recording is carried out by turning it over and permutation coils. The range of recorded and reproducible frequencies at a speed of 78 rpm is 100 ... 7000 Hz, at 33 rpm 100 ... 3000 Hz. The speed of pulling the magnetic tape in this case was 19.8 and 9.4 cm / s, respectively. The prefix did not have a power supply, so it received the necessary voltages from the base unit through the connector, consuming about 1.5 watts of power. Rewinding modes in the console were absent, although in principle this was done, but in a very clever way. Cost tape recorder "Wave" - "‹"‹300 rubles.