 Up to 1980 tape recorders supporting Dolby "B" were often just labelled Dolby "NR".A closely compatible system called  developed by JVC was used instead of Dolby B on some of JVCs cassette decks.In the early 1970s, some expected Dolby NR to become normal in FM radio broadcasts and some tuners and amplifiers were manufactured with decoding circuitry; there were also some tape recorders with a Dolby B "pass-through" mode.