 In 1958, the sound-reproduction world was shaken by the introduction of stereo, and 927s and 930s were quickly adapted to the new system with stereo cartridges, appropriate rewiring of the tonearm and the new stereo preamplifier ‘139st’; it was phased out of production when the more modern solid-state ‘155st’ arrived, in 1960.In that same year, Studer and EMT began to cooperate officially in the professional sound sector, the German firm becoming a distributor of the Swiss equipment for many world markets.The success of this company, directed by Eugene Sporri since 1962, is driven by the Studer C37 and Revox B36/D36 tube recorders.