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Electrophones. General specifications
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Electrophones. General specifications
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Reproducing devices of mechanical sound recording. General specifications
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Electric Playing Devices. The main parameters. Technical requirements. Marking, packing, transportation and storage
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Devices electro-playing and heads of sound readers. General specifications
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Sound pick-up heads. General specifications
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Electric Playing Devices. Acceptance rules
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Acoustic systems. General specifications
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Acoustic household systems
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Amplifiers of low frequency for household with high fidelity of reproduction (category HI-FI). Basic parameters and methods of measurement
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Amplifiers of sound frequency for household. General specifications
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