There were only a few producers of tape recorders in Czechoslovakia. The most important was Tesla, n.p. The main development was realized in Tesla Pardubice, but the mass production was held in Tesla Přelouč. Product numbers were in thousands pieces and tens of model lines. One of the most popular decks was monophonic Tesla Sonet Duo (1959). It was compact, portable and reliable. The collectors of Tesla decks agree that probably the most progressive model was Tesla B73 Hi-Fi Stereo (1978) which provided the principles to the later models. The supreme models were Tesla B115, B116 (1981) and Tesla CM130, CM160 (1986) which were able to compete with similar models made by world’s producers. Still, there were (political) restrictions, so the best ideas and solutions could not be realized. The manufacture finished in 1990 as this technology turned out to be out-of-date.