Description of the system. In the system is used bamboo needle for reproduction of 78 rpm gramophone records. Semiconductors was applied in 78 rpm reproduction head.
The measuring microscope is used for reducing of eccentricity of gramophone records. (photo…). Rotary disk of 33 rpm turntable has weight of 12 kg (26,43 lbs) and made with bronze. Belt drive. The turntable has two loops of automatic control for adjusting of speed. Phono cartridges – DYNAVECTOR or ORTOFON.
The 1930-1940s valves (electronic tubes) was employed in RIAA amplifier.
RIAA schematic is based in RL (resistor, inductor) circuit, capacitorless. The 78 rpm amplifier-corrector has same
schematic. Input and output of analog-digital converter (ADC) have full isolation using input transformator and
output digital isolators. All power supplies of ADC are separated.
Specially designed CLOCK oscillator is using in the system (photo…). Phase noise of the CLOCK is 140 dB at 100 Hz
frequency mismatch. The CLOCK has separate power supply.
The signals of the lowest level are keeped, thanks for listed steps above. The signals of the lowest level
provide fine intonations of music, microdynamic of music and so on. Following formats of digitalisation of music are
available: 44,1 kHz/16 bit, 44,1 kHz/24 bit, 48 kHz/16 bit, 48 kHz/24 bit. After this, a digital content pass into recorder and into file store system.
The digital copies is not prepared for the best sounding, such as reducing of disc noise, cutting of record clicks, more better frequency response and others, because its kill the live music.