Amplifiers, Including Direct-Current, Differential, Multichannel, Audio, Video, Audio-High-Fidelity, Stereophonic, Radio-Frequency and Broad-Band Amplifiers, Pre-Amplifiers and Power Amplifiers, and Parts Thereof, and Consoles and Housings Therefor; Radio-Wave Receiving Apparatus Including Amplitude-Modulation, Phase- and Frequnecy-Modulation Tuners and Parts Thereof, Single and Multi-Channel and Multiplex Circuits, Radio-Amplifying Circuits Adapted for Receiving Radio Broadcast and Television-Band Transmissions, Converters, Antennas and Transmission Lines; Radio-Wave Broadcasting, Rebroadcasting and Relay Equipment, Including Radio-Frequency Generating Apparatus and Oscillators and Parts Thereof; Recording and Reproducing Amplifier Equipment and Parts Thereof Including Phonograph Record and Magnetic Tape Recording and Reproducing Equipment; Phonograph Disc Records; Loudspeakers and Cabinets Therefor; Turntable Apparatus Including Phonograph Record Players, Pickups and Arms; Noise Supressors; Electric Filters, Networks, Attenuators, Equalizers; and Electromechanical and Electro-Acoustical Transducers