Mystery switch
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That switch was used for Dolby FM broadcast many moons ago! Dolby FM 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. In 1971 WFMT started to transmit programs with Dolby NR,[2] and soon some 17 stations broadcast with noise reduction, but by 1974 it was already on the decline.[3] Dolby FM was based on Dolby B,[4] but used a modified 25 µs pre-emphasis time constant and a frequency selective companding arrangement to reduce noise. A similar system named High Com FM was tested in Germany between July 1979 and December 1981 by IRT.[5] It was based on the Telefunken High Com broadband compander system, but never introduced commercially in FM broadcasting.[6] Yes it is important that you use 8 ohm speakers. That switch was used for Dolby FM broadcast many moons ago!Dolby FM 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. In 1971 WFMT started to transmit programs with Dolby NR,[2] and soon some 17 stations broadcast with noise reduction, but by 1974 it was already on the decline.[3] Dolby FM was based on Dolby B,[4] but used a modified 25 µs pre-emphasis time constant and a frequency selective companding arrangement to reduce noise. A similar system named High Com FM was tested in Germany between July 1979 and December 1981 by IRT.[5] It was based on the Telefunken High Com broadband compander system, but never introduced commercially in FM broadcasting.[6] Yes it is important that you use 8 ohm speakers. That switch was used for Dolby FM broadcast many moons ago!Dolby FM 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. In 1971 WFMT started to transmit programs with Dolby NR,[2] and soon some 17 stations broadcast with noise reduction, but by 1974 it was already on the decline.[3] Dolby FM was based on Dolby B,[4] but used a modified 25 µs pre-emphasis time constant and a frequency selective companding arrangement to reduce noise. A similar system named High Com FM was tested in Germany between July 1979 and December 1981 by IRT.[5] It was based on the Telefunken High Com broadband compander system, but never introduced commercially in FM broadcasting.[6] Yes it is important that you use 8 ohm speakers. That switch was used for Dolby FM broadcast many moons ago!Dolby FM 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. In 1971 WFMT started to transmit programs with Dolby NR,[2] and soon some 17 stations broadcast with noise reduction, but by 1974 it was already on the decline.[3] Dolby FM was based on Dolby B,[4] but used a modified 25 µs pre-emphasis time constant and a frequency selective companding arrangement to reduce noise. A similar system named High Com FM was tested in Germany between July 1979 and December 1981 by IRT.[5] It was based on the Telefunken High Com broadband compander system, but never introduced commercially in FM broadcasting.[6] Yes it is important that you use 8 ohm speakers. You will damage the amp if you don't! |
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