An A-C. Operated Sound Motion Picture Reproducing Equipment
This paper describes the RCA-Photophone type PG-30 sound motion picture reproducing equipment, which requires no batteries or motor-generator sets for plate, filament, and bias voltages, for operation in theaters wired with the normal 105 to 125 volt, 50 to 60 cycle, a-c. power. This equipment, primarily designed for theaters having seating capacities for 1000 persons or less, operates with inaudible output hum under operating conditions, is economical of the space it occupies, is easily serviceable, has an over-all frequency characteristic anticipating future improvements in sound-on-film recordings, has sufficient undistorted power output for providing satisfactory distribution of sound in the type of theater for which it is designed, and has provision for the addition of a remotely operated volume control where desired.
- Print ISSN
- 0097-5834
- Published
- 1931-06
- Content type
- Original Research
- DOI
- 10.5594/J08045