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UNITRA Radmor was a prestigious Polish hi-fi audio equipment manufacturer operating as part of UNITRA (Electronic and Telecommunication Engineering Industry Association) from 1961-1989, headquartered in Gdynia near Gdansk during Poland's communist era. As a division of the state-owned electronics conglomerate that employed over 100,000 people across 28 manufacturing companies, UNITRA Radmor specialized in high-quality stereo receivers and amplifiers, becoming synonymous with modernity and previously unattainable technology for Polish consumers in the 1970s-1980s. Their flagship product was the revolutionary Radmor 5100 Stereo HiFi Quasi Quadro amplituner (1977-1979), featuring innovative dual stereophonic power amplifiers enabling 'quasi quadro' spatial sound through front and rear speaker configurations, with over 150,000 units produced across variants including OR-5102, OR-5102T, and OR-5102TE through 1986. Built using modular construction with anodized aluminum chassis and mahogany wood casing (adapted from radiotelephone manufacturing techniques), the technically advanced OR-5100 achieved export success to France and represented Polish engineering excellence during the People's Republic period. Following the 1989 political transformation and UNITRA's dissolution, individual member companies became independent but struggled against Western competition, effectively ending Radmor's hi-fi operations. Note: The current Radmor S.A. (established 1947, part of WB Group since 2011) operates as a separate military communications equipment manufacturer also based in Gdynia, with no connection to the defunct hi-fi audio brand.