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Ampex audio and video audio recording broadcast camera lens camera-receiver capability classroom Close-up lenses closed circuit systems coaxial cable color device dropout dubbing ease of operation equipment dealer evaluation Figure half-inch helical scan instant replay instructional experiences Instructional Television Association KINESCOPE lens attachment low cost machine manufacturer microphone microscope motion picture NATIONAL EDUCATION ASSOCIATION necessary needs objectives papier mache personnel photographic picture quality played back portable equipment portable situations portable systems portable television cameras portable television equipment portable video tape production PVTR equipment PVTR records PVTR systems PVTR's receiver/monitor recording and playback recording head reel require rewind Sacramento State College scenes screen shoulder-pack PVTR switch teacher television picture television program television receiver television signals television studio Threading The PVTR transmission transmitted utilization Valley Instructional Television video and audio video recording video signals video tape recorder videotape vidicon tube viewfinders visual zoom lens