User manual BOLEX D8LA

[. . . ] Optical sound system protected, sealed, and completely shielded from ligllt from valves or other sources. 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. [. . . ] 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 volume controls for microphone and pick-up, radio or tape recorder; independent tone controls for bass and treble. A built-in mixer permits professional results through the combination of sound effects, narration, and music. Separate aural control, by means of earphones, over sound quality and volume. High impeCiance input channels for microphones, pick-up, radio, or tape-recorder. 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. Certain parts in the magnetic sound head are made to a tolerance even greater than 1/10, 000 of an inch. The finished projector, as a result of this unhurried and precise manufacturing, will give years of prime performance. OPTICAL FEATURES Standard 750 (code: BENGE) or 1000 Watt (code: BERSO) projection lamp is mounted on hinged lcmphouse door for most convenient changing. Lamp current can be adjusted and measured on built-in meter to provide brightest picture and longest lamp life. Aspheric reflector and condenser system has three coated elements which can be cleaned easily on both sides. Framing is conveniently regulated with a knurled knob which moves the film and does not disturb the centering of the image. 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. and is accurately stabilized by a ~overnor activated by electronic Impulses. [. . . ] 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 . . . [. . . ]