Broadcast receivers and phonographs for classroom use
Committee on scientific aids to learning, 1939 - Technology & Engineering - 94 pages
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QUALITY OF REPRODUCTION
What is a simple way of comparing receivers? 1619
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ampere hours amplifier and loudspeaker antenna audio frequency Automatic noise suppressor Automatic volume control bass and treble bass notes broadcast band broadcast receivers cabinet characteristics Company comparatively Console Crystal pick-up desirable Double spring dry batteries electric power electrical currents following devices forms of distortion frequency band frequency response grooves harmonic distortion high frequencies installation inverse feed-back circuit John V. L. Hogan List price listening located loudspeaker low frequencies manufacturers material phonograph attachment phonograph equipment portable possible power mains power output Price in quantities programs push button tuning quality of reproduction quantities of 200 radio set radio-phonograph ray tuning indicator record changer reduce regular broadcast reverberation rural schools self-reverberation sensitivity sides of 12 sound waves speaker special circuits speed storage batteries switch tion tone quality tone with volume transforms tube ultra-high frequency undistorted output usually vibrations volts volume of sound watts wave trap wire