CD player "Luch-001".
CD players.The "Luch-001" CD player was created in 1978 in a single copy by the laser recording laboratory of VNIIRPA named after A.S. Popov. Before the introduction of the international standard "Compact Disc Digital Audio" there were still several years left, so each manufacturer experimented with their own recording formats. PKD "Luch-001" reproduced discs with a diameter of 12 cm, the sampling frequency was 44.1 kHz. That was where the similarity to CDs ended. Used 11-bit quantization, the discs themselves were somewhat thicker than the usual CDs and were made of glass. The turntable consisted of two blocks: the upper one housed the optics, mechanics and control systems, the lower one - a digital decoder. The apparatus used an LG-75 helium-neon laser, which had large dimensions and operated from high voltage; As a result, it was decided to make the optical unit ("laser head") stationary - and the disk rotating on the spindle itself moved relative to the laser microlens. Photos and information from the site http://red-innovations.su/sheets/pcd.html
