International projectionist (Jan 1959-Dec 1960)

Record Details:

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1 : / / "Stereo": What it is and What it Does The new Unicorn tape splicing kit. butt splices on damaged or broken tapes in less than one minute. Priced at only $10 complete, the kit includes a splicing block to align the tape for accurate hole location, a supply of pre-punched pressure-sensitive tape for splicing, and a tube of cement for fusing splices. Unicorn is at 1040 No. McCadden Place, Hollywood 38, Calif. Two New Kalart Film Aids The Kalart Co. is now offering two new items. First, the Custom 8 dualpurpose splicer for simple editing and repairing of 8-mm film and using either new pressure-sensitive adhesive tapes or conventional cement. It has sprocket-hole guide pins on top which hold the film precisely at the frame for fast butt splicing with tape. For cement splices there are provided scissor-edged plates which make clean cuts for an overlap splice and a floatingaction scraper which quickly removes the emulsion. Price: $4.95. The second new item is the Craig "Pro" rewind for 2000-foot reels of 16mm film. Featured is a spring device which automatically disengages the crank when not being turned, thus preventing "flywheeling." A tension brake and locking device provide full control when winding or rewinding. Other features include large wooden handles and counterbalanced crank. Price: SI 8. 50 per pair. New Kodak Color-Slide Data "Some Sources of 2 x 2-Inch Color Slides" (S-2), a twelve-page pamphlet, providing an up-to-date list of producers and distributors of color slides, is now available in a revised edition from Eastman Kodak. Listed are fifty-eight firms in the United States, Alaska, Hawaii, Cuba, Mexico and Norway grouped according to the general type of slides provided by each firm. The address of each firm is given along with more specific information on the slides available. Free copies are available from Sales Service Division, Eastman Kodak, Rochester 4, New York. The third and concluding article in a definitive series on stereophonic sound; prepared by Fairchild Recording Equipment Corp., 10-40 45th Ave., Long Island City, N.Y. HAVING defined the nature of stereophonic sound, we may now consider those factors relative to the selection and utilization of equipment used to reproduce it. In essence, the equipment required for stereo are two amplifiers (and preamplifiers if separate ones be used) and two speakers, in addition to a stereo pickup. But this is not the whole story. If you already have a single channel system, you will require only a pickup and a second amplifier and speaker channel. This will give stereo sound, even if the quality of the second channel is not the equal of the first channel. If you have no system at all, you can buy a two-channel system. Some people are already using two channels for AM-FM stereo or for tape stereo. All that is necessary in such cases is a stereo pickup and, possibly, a stereo preamplifier, since most tape preamplifiers will not work with phonograph pickups. The power amplifiers and speakers will work just as well for disc stereo as for any other stereo, of course. Questions Commonly Asked Following are some of the questions most commonly asked regarding stereo reproduction : Must the second channel be of equal quality with my first channel, oi can I save money and still obtain stereo results? Always remember that plugs and jacks are conductors of a possibly lethal medium (electricity) and require careful handling so as to not wrench leads or split wires which cause "shorts" and can interrupt a showing or, more serious, occasion severe physical injury. Extensive experiments indicate that while it is possible to obtain stereo effects with a poorer second channel, the overall effect will certainly not be as good as with two good channels. Having one moderately good channel which I was planning to replace with better equipment, should I now buy a second channel ot equal quality in order to achieve "match", or should J buy the best second channel I can afford? Buy the best possible second channel even if it be better than your present equipment. If later you can afford a further investment, then the other channel may be upgraded. Must I buy equipment ot the same make iox my second channel? No. As long as the second channel is of comparable quality to (or better than) the first, it matters not what make it is. Vital Equipment Facts What are the important facts to be considered in buying stereo equipment, such as pickups, for instance? The important characteristics of all stereo equipment are the same as for monaural equipment, except that in most cases stereo should be of better, rather than of poorer, quality. For instance, high compliance is important in LP cartridges; it is even more important in stereo cartridges. Low distortion is also of great importance, and so is good tracking ability (the ability of the cartridge to follow faithfully every complex motion of the groove). There are additional requirements, such as channel separation. For excellent stereo results, about 15 db of rejection between channels is required (talk of 40, 50 or 60 db separation is unrealistic and, fortunately, entirely unnecessary, and may be credited to the gyrations of advertising brains rather than engineering ones). This separation should be maintained over the entire frequency response range, however, and this is less easy to achieve. It may be that at some frequencies higher separation may be attained, but the figure given should be maintained at all audible frequencies. On the other hand, wide frequency range is not so important in stereo, and very good results can be obtained with a flat response to 10 or 15 kc. The Source of "Rumble" What about turntables? What about rumble? Rumble is a problem with all disc reproduction. Rumble is nothing but 18 INTERNATIONAL PROJECTIONIST • MARCH 1959