User manual BOLEX D8LA

[. . . ] Magnetic sound head is ruggedly constructed for greatest resistance f wear and tear. Erase head operates on a high frequency magnetic field to assure complete erasure of previously recorCled souna. lhe erase head is located next to the recording head for instant switching when required. The wide range, simplicity of use and robust construction of the sound"Unlf are another three highly appreciated advantages, to add to the many already boasted by the D8LA projector. AMPLlFIEJl Accidental erasure of recorded sound and other errors are impossible because all controls are centrally located and include safety devices. [. . . ] Separate aural control, by means of earphones, over sound quality and volume. Voltage selector for maximum efficiency. High impeCiance input channels for microphones, pick-up, radio, or tape-recorder. 6 Ohm output channel for speaker and 50 Ohm output for earphones. The amplifier of the D8LA projector can be used in a public address system and so allows one to give a commentary or sound effects when projecting a silent film. 2 PICTURE QUALITY system is built into the D8LA to and equal light distribution. A unique condenser-reflector provide maximum brightness Three fast projection lenses are available in 35, 50, and 75 mm focal lengths. Each lens is composed of six elements and conforms to the most rigid standards of optical precision. Fully corrected for aberrations, these «HI-FI» lenses are you, guarantee of perfect color and freedom from distortion. The claw mechanism and film guides on the D8LA are made to exacting tolerances to ensure absolute steadiness of the projected image. Picture flicker is completely eliminated because the shutter can be regulated for two or three light interruptions per frame, either while the projector is running or stopped. At any projector speed, with the screen at any distance, pictures are bright, sharp, and flicker free. 4 CONVENIENT TO USE 3 Streamlined and compact, the Bolex D8LA sets up easily in seconds. The loudspeaker in the cover can be quickly detached for location in another area of the room, and the projector height adjusts instantly at the turn of large, convenient leg controls. Lenses available include 35 mm f/1. 3, code: SOPRO - 50 mm f/l. 3, code: SOCAN, and 70 mm f/1. 6, SOSEP. The shutter is adjustable in order to eliminate flicker while projecting. MECHANICAL FEATURES Universal type motor with high starting torque. It runs silently, has push button stop and three position switch for reverse and forward with or without lamp. The speed is variable from 18 to 24 f. p. s. and is accurately stabilized by a ~overnor activated by electronic Impulses. A built- in illuminated stroboscope shows n precise 18 or 24 f. p. s. running ""--O""';;;. -L~~_ speed. Built-inframe counter with manual zero setting automatically shows every ten frames and can be read easily while the projector is running. This is an invaluable aid when recording and a particular part of the sound track must be picked out quickly and accurately. ACCESSORIES Voltmeter (0 to 260 volts) For checking the power supply on the projector. Code: VOlEM. Microphone (included with D8LA projector) High-fidelity dynamic microphone . . . Code: SOMIC. Auditorium Speaker 12" diameter, 15 Watt with 50 foot electric cord on reel with permanent contacts. [. . . ] 2 sizes available: for 2000 and 800 ft of film. Codes: 800 ft reel: DOSlE; same reel with can: DURHO; 2000 ft reel: BOSON; same reel with carton: BOBSI. Earphone (for monitoring recording) Impedance: 50 ohms at 1, 000 cycles - Double channel - 5 ft cable and jack. Code: SOECO. Extension cable 65 ft long for loudspeaker. [. . . ]