The front panel has two RCA inputs for the RIAA and an earth terminal. The top plate has four lamps in aluminum covers. Also on the top plate there are two buttons
used to select the device's operating mode and potentiometer. The amplifier's operating modes are a classic line preamplifier or a phono preamplifier with RIAA inverse frequency correction. The blue LED indicates the operating mode. In the rear part of the top plate there is a cover protecting the power transformer. The rear panel has a network socket and a pair of RCA inputs for connecting a CD or DVD player. There are also RCA outputs. The first pair with a voltage of 0.25V and
second pair with 0.7V voltage. The power switch is located on the left side panel.
Description of the RIAA characteristics
Acoustic recording on gramophone records is carried out by means of a stylus which cuts the mother disc.
The stylus covers is proportional to the amplitude. To obtain a constant level of independent signal from the frequency, stylus swings must be used at a lower signal frequency. With this recording, the groove amplitude would be very large. Reduced to the time of recording on the dependent distribution, the distance of the medusa with grooves would be increased. To collect would be difficult to read and the turntable needle would have to track a groove with a larger amplitude. On the other hand, with high frequencies there is a noise level problem, the amplitude of the oscillation decreases in the level of signal frequency, and thus the noise distance decreases. Correction of frequency response made before cutting mother boards comes in handy. All of the turntable preamplifiers contain a correction system and inverse characteristics. In 1955, the American association of the phonographic industry RIAA developed a correction curve that became available by the standard used
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