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Damals wie auch Heute wurden neue Erkenntnisse relativ schnell veröffentlicht. In der US-AUDIO 1959 erschienen sporadische Listen von neuen Büchern, Heften und sonstigen Blättern, mal von den Verlagen, mal von den Herstellern. Nicht alle Ankündigungen waren Hifi- oder Stereo- bezogen, aber der US-AUDIO-Verlag brauchte auch interessante Neuigkeiten für seine Leser.
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• • Newark Electric Company, 223W. Madison St., Chicago 6, Ill., is now distributing its 1959 catalog No. 69. Covering thousands of industrial-electronic, amateur, radio, television, and high-fidelity items, this new 388-page buying reference features extensive quantity price breakdown listings which are competitive with manufacturers' price schedules. Fully illustrated and replete with comprehensive descriptions, the catalog also contains a convenient products and manufacturers index to facilitate reference to specific items. Your copy wTill be mailed free upon written request.
• • CBS-Hytron Advertising" Service, Parker St., Newburyport, Mass., is now distributing "An Introduction to Stereophonic-Sound," the first of a series of "Stereo-Talk" bulletins, which tells what stereo is and how it works. The four-page publication describes how a stereo record is produced using the 45/45 Westrex system, and illustrates how the playback stylus motion is converted into separate signals for each channel. Components needed for a disc stereo system are listed and some typical questions on stereo are answered. Requests for copies should specify Bulletin E-305.
• • Argos Products Company, Genoa, 111., announces Catalog No. C-58, a complete listing of the company's wall and corner baffles and high-fidelity speaker enclosures. This is an excellent publication for custom builders, irrespective of whether their work involves commercial installations or equipment for the home. The new Argos "Californian" series of pre-finished kits will be of exceptional interest to the hi-fi hobbyist. Your copy of Catalog C-58 will be mailed upon written request.
• • Commercial Engineering Department, RCA Electronic Tube Division, Harrison, X.J., has just issued a colorful 137-page book, the "Designer's Guide" to Preferred Tube Types, covering entertainment receiving tubes. Format of the handsomely-bound volume presents technical data in easy-to-read fashion. Color is widely used throughout the book to enhance readability and to highlight graphs and curves. Specially prepared for the men who design high-fidelity audio equipment, phonographs, radio receivers and TV sets, the book contains tube characteristics, dimensions, and base diagrams. Requests for copies of the "Designer's Guide" must be written on company letterhead.
• • United Catalog Publishers, 60 Madison Ave., Hempstead, N.Y., is now releasing a 24-page industry-wide booklet which provides listings of all available panel, flashlight, neon-glow, automotive and multipurpose lamps. Incorporated in the booklet is a composite listing, arranged numerically, of lamps manufactured by Chicago Miniature Lamp Works, General Electric, National Carbon, Oxford Components, Radio Corporation of America, Raytheon, Tung-Sol and Westinghouse. Simply by checking the lamp number the user can determine at a glance the manufacturer, bulb type, base, voltage, current, and bead color. All bulb types are illustrated with physical dimensions. Requests for copies should be addressed to The Radio-Electronic MASTER at the address shown above, and must include a remittance of ten cents to cover handling costs.
• • David Bogen Company, P.O. Box 500, Paramus, N.J., includes its complete new line of high-fidelity equipment in Catalog 510 which is just off the press. Among new units listed are the Model DR230 stereo control center and dual 30-watt amplifier, Model ST662 FM/AM stereo tuner, and Model DB130A preamplifier-ampiiner. irtequests tor copies should be addressed to the Advertising Department.

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• • General Electric Company, Dept. SEC, West Genesee St., Auburn, N. Y., announces specification sheets on six new GE "Stereo Classic" high fidelity components. They are:
  Sheet No. - Product
  EP-598A - Models FA-11 and FA-12 FM-AM tuner
  EP-594 - Models GC-5, GC-7, and CL-7 stereo cartridges
  EP-651 - Models MS-4000 and MS-200C stereo amplifiers
  EP-654 - Model LH-12 speaker system,
  EP-654 Model LC-12 coaxial speaker,
  EP-654 model LK-12 two-way speaker system kit.
  EP-671 - Model MF-1 stereo preamplifier.
  EP-674 - Model RG-1000 stereo remote control.
  All are available from authorized GE hi-fi component dealers. Name of your nearest dealer may be obtained by writing to the address shown above.
• • Belden Manufacturing- Company, 4 647 W. Van Buren St., Chicago SO, 111., offers 382 new stock items in its 1959 Electronic-Wire Catalog No. 859. This new catalog-has been completely re-designed with all wires grouped by type and application, for easier use. All essential electrical characteristics and construction details are shown for each item, with each type of wire clearly illustrated. Typical listings include shielded microphone and power supply cables, TV camera cables, hi-fi, stereo and phonograph cables, and cables for installation of intercom equipment.
• • Microtran Company, Inc., 145 E. Mineola Ave., Valley Stream, N. Y., has available a new short form catalog" listing complete specifications of Microtran transformers. These include miniature, subminiature, transistor, MIL-T-27A, and industrial transformers which are available from distributor stock. The short form catalog serves as a ready reference for a quick run-down on Microtran transformers, showing the wide range of models at a glance.
• • Leonard Radio, Inc., 60 Cortlandt St., New York 7, N. Y., announces publication of the "Hi-Fi Guide," a 128-page catalog of high-fidelity parts and equipment. Contained in the book are complete listings of monophonic and stereophonic compo-Copies of the catalog are available on request.

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• • Pilot Radio Corporation, 37-50 36th St., Long- Island City 1, N. Y., announces the publication of a new booklet titled "Stereo and You." In "Stereo and You," Pilot has endeavored to answer questions which dealers and the public have been confronted with since the introduction of stereophonic sound. Your copy of this interesting- and worth while book will be mailed free upon written request.
• • Sonotcne Corporation, Elmsford, N. Y., explains the entire process of stereo recording and reproduction in a new pocket-size booklet titled "Stereo Simplified." Intended to help music lovers who are interested in purchasing new stereo equipment as well as those planning to convert present monophonic sets, this booklet will be of great value to the person who is still wondering just what stereo is all about.
• • Viking* of Minneapolis, Inc., 9600 Aldrich Ave., South, Minneapolis 20, Minn., now has available for general distribution a new accessories catalog. Listed and illustrated is a wide range of items which add greatly to the flexibility of the Viking 75 and 85 Series tape decks. Of particular interest is the "88" speaker, providing as it does a small-area source along with better-than-average speaker performance.
• • Hexacon Electric Company, 266 W. Clay Ave., Roselle Park, N. J., announces a new catalog sheet covering Long-Life soldering iron tips. Shown are 81 new shapes and sizes, a total of 124. Included are plug tips from 1/16" to lVs" and screw tips from 7/16" to 1%" diameter. Various tip shapes are illustrated, complete dimensions are given, as well as advice on use and care. Also included are list prices. If you use soldering iron tips industrially, this listing will probably mean great savings.

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• • Alpha Wire Corporation, 200 Varick St., New York 14, N. Y. is now offering free a wire-stranding chart, designated ZK-4, which makes it possible to determine rapidly the available stranding combinations for various sizes of conductor wire. This information is shown on a one-page reference chart which also tells the number of smaller gauge wires necessary to make up the cross-sectional area of a conductor. The chart is free, and will be furnished on request to Alpha Wire Corporation, or in response to the Reader Service Card.
• • Astron Corporation, 255 Grant Avenue, East Newark, New Jersey, announces the availability of Service Replacement Catalog AC-7 which covers technical data on the company's full line of capacitors and niters for radio, TV, and electronic applications. The illustrated 16-page booklet features a photographic "guided tour" of the Astron plant and explains product production from researching and engineering to testing and quality control. Complete product listings are also shown.
• • Electron Tube Division of "Radio Corporation of America" has just announced the latest edition of the well known RCA Receiving Tube Manual, RC-19. This manual, which is claimed to have sold more than two million copies since 1947 in earlier editions (and we wonder how many more were sold before then, for we remember them much further back than 1947), is the most comprehensive and authoritative book of its type in the industry. The new edition has been revised, expanded, and brought up to date. It contains technical data for more than 625 receiving tubes, including types for black-and-wThite and color television, series-string applications, 12-volt automobile radio receivers, and high fidelity audio, and more than 95 picture tubes including color types. A veritable education in vacuum tubes and their applications, this new manual also covers basic tube theory in the same easy-to-un-derstand style used in previous editions.
  The section on Electron Tube Applications has been expanded to include a description of tone-control circuits for hi-fi audio amplifiers and high-voltage regulator circuits for TV use. Other sections include information on generic tube types, interpretation of tube data, and electron-tube installation.
  The Receiving-Tube Classification Chart has been revised to show the latest tube data, and types designed for series-string applications are specially marked for easy selection. The popular Circuits section at the back of the book shows a, new intercom for three or more stations and several new high-fidelity audio amplifier circuits including preamps for magnetic and ceramic pickups, an audio control unit incorporating both volume and tone controls, and two complete hi-fi amplifiers having outputs of 10 and 35 watts, respectively, and suitable for both monophonic and stereo applications. Copies of the RC-19 RCA Receiving Tube Manual can be obtained from RCA Tube distributors, or by sending 75 cents to Commercial Engineering, Electron Tube Division, Radio Corporation of America, Harrison, New Jersey.
• • Astron Corporation, East Newark, N. J., is making available to design engineers a series of publications called "Techniques," covering a variety of subjects in the capacitor field. The current issue deals with "Application Notes on the Solid Electrolytic Tantalum Capacitor," in an article by Matthew Katz, Engineer in Charge of the Tantalum Department of Astron Corporation. Other Astron components will receive similar treatment in subsequent issues to provide ready visualization for the design engineer seeking characteristics for special problems.Requests for copies should bo addressed to Astron Corporation, 255 Grant Ave., East Newark, N. J.

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• • General Electric Company, West Genesee St., Auburn, N. Y., has prepared an entirely enlightening 24-page booklet titled "Fifteen Minutes to Stereo." Directed strictly to the layman, this publication does an excellent job of filling the demand for a succinct statement of just what stereo means to the average home. In all respects it lives up to its subtitle, "A Basic Guide to Stereo Hi-Fi." Available at G-E component dealers for 25 cents.
• • Sarg-ent-Rayment Co., 4926 E. 12th St., Oakland 1, Calif., displays its complete line of high quality tuners, amplifiers and audio accessories in a handsome new 12-page catalog which has just been released. Colorfully illustrated and replete with technical specifications of all items discussed, including the new S-R multiplex adapters, this brochure should be read before making final decisions in assembling your stereo music system. It is available on request.
• • University Loudspeakers, Inc., 80 S. Kensico Ave., White Plains, N. Y., announces a new product catalog containing full information, illustrations and specifications of all new and current University public-address speakers and components. Grouped together are the following main categories of speakers and accessories: Trumpets; Paging and Talk-Back; Submergence-proof speakers; Hi-Fi Weatherproof Dual-range Systems; Super Power Projectors; Portable Soundcasting Systems, and Drivers and Accessories. The final two pages of the catalog contain hi-fi speakers and enclosures suitable for commercial installations. Available free, on written request.
• • Amplifier Corp. of America, 398 Broadway, New York 13, N. Y., is now distributing a six-page brochure describing and illustrating the new line of TransMagne-mites, a series of transistorized, battery-operated, spring-motor portable tape recorders designed for professional field applications. Single- and multi-speed models with or without VU meters are available and are listed with their respective recording characteristics tabulated for easy reference. The recorders' operations are concisely explained and complete technical specifications, recommended accessories, and direct factory prices are included. The brochure will be mailed free upon written request.
• • French Electronic Directory. The second issue of the buyer's guide to the French electronics industry has just come off the press. Completely brought up to date and considerably augmented, this directory provides the most comprehensive comparative source of information of every industrial product manufactured by the French Electronics and allied products industries. It contains addresses of all French electronics firms, 600 pages of short-form technical catalogues listing all available products, over 100 pages devoted to manufacturers and sub-contracting firms, as well as a description of the industry itself, its structure, and a complete professional directory.
  The directory is in two volumes, solid cover, with 1100 pages, and weighing two pounds. Expensively produced, with some 750 color pages, the two-volume set costs 6100 Fr., (approximately $17.50), and will be found of exceptional value to those who either buy from or sell to the French market. It is the first four-language reference work, (French, English, German, Italian), devoted to a single industry to be compiled specifically on a Common Market basis for the benefit of engineers, procurement departments, and civilian and military users of electronic equipment. The directory may be obtained from Publicite et Editions Techniques, 161, Blvd. St. Germain, Paris VI°, France.

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• • Electro-Voice, Inc., Buchanan, Mich., has just published one of the most handsome and worth-while high-fidelity catalogs ever to be produced. A completely new and colorful guide to the extensive E-V line of speakers, enclosures, and speaker systems, Catalog 134 also contains a well-written introduction to stereo sound and illustrates proper placement of speakers in stereo music systems. Irrespective of your interest in speakers and speaker systems - whether layman or professional - this catalog will be a worthy addition to your audio library. Available upon written request. Specify Catalog 134.
• • Valor Instruments, Inc., 13214 Crenshaw, Gardena, Calif., has performed a fine industry service with the publication of "Audio Transistor Kinks," Vol. 1, No. 1, a four-page folder covering "Voltage Breakdown and Leakage Current in Transistors." Written on a professional engineering level, these articles have stimulated a great deal of favorable comment so far, and will undoubtedly be of considerable interest to AUDIO'S readers who work with transistors in any manner.
• • Jensen Manufacturing- Company, 6601 S. Laramie Ave., Chicago 3S, 111., fully illustrates and describes its new line of monophonic and stereo speaker systems in Catalog 165-C which will be mailed free upon written request. Complete specifications of the new Jensen tube-vented Bass-Superflex enclosures for high-compliance Flexair woofers are included. The Stereo Director units which are said to permit "aiming" of directional frequencies, thus eliminating the need for angling cabinetry, are fully explained. Also ill-lustrated and described are the Jensen kits for those who wish to build their own cabinets or built-in speaker systems. An excellent catalog. Write for a copy.
• • CBS-Hytron Advertising1 Service, Parker St., Newburyport, Mass., will mail free a copy of a most interesting article titled "Why a Ceramic Cartridge?" Written by Bud Tomer, this 4-page folder does an excellent job of analyzing the basic differences in crystal, ceramic, and magnetic pickups. Although proponents of other types of cartridges may take issue with certain of its conclusions, no one will deny that the author presents his case with force and authority. Write for this excellent piece of audio literature - of interest to engineers and hobbyists alike.
• • University Loudspeakers, Inc., SO S. Kensico Ave., White Plains, N. Y., has just issued a handsomely-prepared 16-page booklet appropriately titled "An Informative Guide to High Fidelity Stereo and Monophonic Speaker Systems and Components." Available free upon written request, this book is full of useful information, tips and practical suggestions of interest to everyone contemplating building or improving a hi-fi speaker system. In addition, there is a complete, concise, illustrated description of every speaker and accessory component manufactured by University. Direct your request for a copy to Desk BL-1.
• • The Turner Company, 909 17th St., X.E., Cedar Rapids, Iowa, will mail upon request a new catalog on the company's entire line of microphones, stands, and other miscellaneous accessories. Illustrations, specifications, and description of each product make this publication an excellent handbook for the selection of microphones and accessory equipment for any application. Write for it.
• • Amplifier Corp. of America, Trans-Magnemite Division, 398 Broadway, New York 13, N. Y., will mail without cost a new 6-page brochure describing in detail exclusive mechanical and electrical features of the latest TransMagnemite transistorized, battery-operated, spring-motor portable tape recorders which were engineered especially for professional field applications. Single- and multi-speed models are available and listed with their respective recording characteristics tabulated for easy reference. The recorders' operations are concisely explained and complete technical specifications, recommended accessories, as well as direct factory prices are included.

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• • Jensen Manufacturing" Company, 6601 S. Laramie Ave., Chicago 38, 111., will mail Brochure KK, an illustrated sheet covering- the new DF-1 Duette speaker system, without cost or obligation. This latest Duette model is an economically priced full two-way system featuring wide frequency range with clean bass response down to 36 cps. It is well illustrated and thoroughly described in the brochure.
• • Unimax Switch Division, The W. L. Maxson Corporation, Ives Road, Walling-ford, Conn., introduces an extensive line of subminiature switches which meet Military Specifications for a wide variety of rigorous services in Catalog No. 159. Convenient pictorial index shows where to find dimensional drawings, descriptions, force and movement specification tables, and electrical ratings for each Unimax switch listed. Data on bases, terminals, circuit arrangements and NEMA standard definitions of sensitive switch terms are also included. Requests for copies should be directed to the attention of Mr. J. Martinez.
• • Atlas Sound Corporation, 1449 39th St., Brooklyn 18, N. Y., illustrates and describes its complete line of commercial sound equipment in a 16-page two-color catalog which is now available. The catalog also commemorates the company's twenty-fifth anniversary as an industry leader in its field. Included in the publication are explanatory technical diagrams and full specifications on all Atlas loudspeakers, transformers, driver units, and speaker and microphone mounting accessories. Among new models introduced for the first time this year is a Decor speaker for attractive interior installation. Catalog1 No. 559 may be obtained without cost by writing to the address shown above.
• • Lipps, Inc., a division of Lipps Engineering, 1513 Colorado Ave., Santa Monica, Calif., announces the publication and availability of a 4-page brochure describing a new replacement and repair service now available to owners and users of Ampex professional and instrumentation recording equipment. Requests for copies should specify B'ulletin AM-22.
• • Electro-Voice, Inc., Buchanan, Mich., is now releasing Bulletin 258A, a new sales folder describing the E-V line of public-address equipment. This publication gives full information on compound diffraction projectors, paging units, outdoor speaker systems, accessories, and microphones. A copy of Bulletin 258A will be mailed upon written request.
• • Telectrosonic Corporation, 35-16 37th St., Long Island City 1, N.Y., describes and illustrates its new line of tape recorders in a 12-page consumer brochure which has just been published. The booklet is divided into two sections, the first of which is devoted to the enjoyment and advantages found in tape recording. Section Two is concerned with the five consumer models now made by Telectro. The brochure is amply illustrated with photographs and descriptive line drawings showing the units and the operation of their various features. Available free upon written request.
• • The Tape Recorder Club, 73 Grand Parade, Harringway, London, N.4, England, has published the latest issue of its Club Bulletin. A large number of the Club's members are "very keen to make contact with American tape recorder owners," and with this thought in mind D. V. Lane, Principal, has asked that we bring the matter to the attention of our readers. Letters of inquiry should be addressed to Mr. Lane at the address shown above.

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• • Valor Instruments, Inc., 13214 Crenshaw Blvd., Gardena, Calif., will mail free a 4-page pamphlet which discusses the maximum power dissipation in transistors. Methods of determining the maximum power which may be dissipated by a transistor and the effects of maximum power dissipation on circuit considerations are illustrated. Factors to consider in arriving at an allowable collector dissipation such as thermal runaway are also explained. This is an excellent treatise for the audio design engineer.
• • Electro-Voice, Inc., Buchanan, Mich., has just released Catalog 120A, a descriptive new guide to Electro-Voice professional microphones. This complete catalog contains the photograph, response curve, polar pattern, wiring diagram, dimensions, and complete specifications for each microphone. A copy of this informative booklet should join the technical library of every broadcast station, motion picture studio, and recording studio in the country. It will be mailed upon written request, or may be obtained from E-V distributors.
• • Unimax Switch Division, The W. L. Max-son Corporation, Ives Road, Wallingford, Conn., presents detailed information on the expanded line of Unimax snap-action precision switches in its new 28-page Catalog No. 359. Convenient pictorial index shows where to find dimensional drawings, descriptions, force and movement specification tables, and electrical ratings for each Unimax switch listed. Data on bases, terminals, circuit arrangements, and XEMA standard definitions of sensitive switch terms are also included. Requests for copies should be directed to the attention of Mr. J. Martinez.
• • Ohmite Manufacturing Company, 3630 Howard St., Skokie, 111., has done the electronics industry a distinct favor with the publication of its new Catalog No. 30. Complete in every respect, well planned and clearly printed, this catalog should be in the hands of every person engaged in the purchase of electronic gear on a professional scale. Design and production engineers alike will find this comprehensive listing of Ohmite products to be of great value in their work. Available on written request.

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• • Semiconductor and Materials Division, Radio Corporation of America, Somerville, N. J., announces availability of the "RCA Semiconductor Products Handbook HB-10," devoted exclusively to data on RCA semiconductor devices including transistors and silicon rectifiers. A companion to the "RCA Tube Handbook HB-3," the new publication is available in conjunction with the HB-3, or separately. The new handbook has been compiled to meet the requirements of electronic equipment design engineers primarily, but will prove useful to all who have need for up-to-date technical information on semiconductor devices. Convenient loose-leaf form permits revision of data on existing types and the addition of data on new types as they are made available. Subscription to the handbook HB-10 is $5.00 domestic ($5.50 foreign), and includes one binder, data sheets, and service for one year.
• • Allied Radio Corporation, 100 N. Western Ave., Chicago 80, 111., is now distributing its new 1960 catalog. Consisting of 444 pages, of which 232 are in color rotogravure, this biggest of all Allied catalogs lists more than 40,000 items. Featuring extensive listings of stereo components, it also includes a wide selection of complete systems. In addition, the catalog lists several do-it-yourself stereo systems featuring Allied's own Knight-Kits. Do-it-yourself enthusiasts will find a bigger-than-ever selection of hi-fi amplifier, tuner, and preamplifier kits, plus expanded listings of custom cabinet kits for speakers and other components. Music lovers who desire the finest in record entertainment will find listed a wealth of specially selected stereo records from which to choose. Latest 16%-rpm "talking book" records are also included. Your copy of this great catalog will be mailed free upon written request.
• • CBS Electronics, Information Services, 100 Endicott St., Danvers, Mass., will mail free Bulletin E-355 which gives complete technical data on the first in a series of complementary NPN-PNP power-transistor lines. These complementary pairs of transistors permit new circuit design economies. The planned line of five NPN-PNP pairs is the result of a customer application survey made by CBS Electronics. The pairs feature high voltage - -up to 100 volts - and proved reliability (exceeding MIL-T-19500A) for audio, control, voltage regulation, servo and computer applications.
• • Audio Fidelity Professional Products Inc., 770 11th Ave., New York 19, N.Y., will mail without charge an attractive folder listing - the complete line of Telefunken microphones as well as a number of professional audio components and accessories. Of particular interest to TV, stage, and motion-picture producers is the "Microport," a small FM receiver and transmitter assembly of the "wireless microphone" type which has a range of approximately 1700 yards. Users of professional audio equipment have a distinct need for this publication. Write for it.
• • General Electric Company, Semiconductor Products Department, Charles Building, Liverpool, X.Y., is now publishing a new edition, the fourth, of the "Transistor Manual," which contains 227 pages of information on transistors and their uses in electronic circuits. Included in the 20 chapters is information on basic semiconductor theory, transistor construction techniques, biasing, switching characteristics, transistor servicing techniques, and several articles on circuitry. In addition, the book contains a revised and up-to-date listing of all American JEDEC-registered transistor types with their basic specifications and interchangeability information. The "Transistor Manual," fourth edition, is priced at one dollar.
• • Allied Radio Corporation, 100 N. Western Ave., Chicago 80, 111., has just published "Understanding Transistors," a 64-page handbook which not only serves as an excellent introduction to transistors, but also as a helpful reference for those already acquainted with the subject. Written by Milton S. Kiver, well-known author of many volumes on electronics, the book opens with a concise discussion of the properties of germanium. Opening sections of the book clarify basic theory and provide a solid foundation for the succeeding chapters. Many transistorized circuits, with a detailed explanation of each, are included. There are more than 50 diagrams and illustrations. Price of "Understanding Transistors" is fifty cents.
• • CBS Electronics, Danvers, Mass., has available for dealers a new phono cartridge cross-reference chart. It lists both CBS-Ronette and Columbia CD cartridges for exact replacement of more than six million cartridges now in use in the U.S.A., and provides a convenient tabulation of technical specifications. Exact-size silhouettes for each cartridge provide a quick identification of model number, and a handy table illustrates and describes various bracket installations. The 8-page catalog, Bulletin PF-285, is available free to independent service dealers through their distributors.
• • Radio Shack Corporation, 730 Commonwealth Ave., Boston, Mass., has just announced publication of its annual electronic parts and equipment catalog, "1960 Guide to Electronic Buying." The publication scores a number of firsts for a parts distributor's catalog. It is printed entirely in rotogravure on 8^" x 11" magazine-size paper stock, contains paid display advertising and articles written by leading authorities, and features a handbook for the engineer and the hobbyist. The catalog lists some 40,000 electronic items. Net, as opposed to list, prices are shown. It includes over 100 pages of hi-fi products, and some 200 pages of industrial and service items. Price of the catalog is thirty-five cents postpaid to consumers; it will be mailed free to industrial concerns requesting copies on a company letterhead.
• • Sylvania Electric Products Inc., 1100 Main St., Buffalo 9, N.Y., has available a new characteristics and replacement guide for semiconductor diodes. Included in the 12-page booklet are complete data on the ratings and electrical characteristics of all Sylvania types as well as a replacement guide to virtually all EIA registered diodes. Copy will be mailed upon written request.

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• Gotham Audio Sales Company, Inc., 2 W. 46th St., New York 36, N.Y., announces availability of complete engineering information service to professional users of Neumann microphones. In addition, an illustrated catalog covering general specifications of Neumann microphones and integral systems will be mailed free to all persons interested. Further, on request specific technical bulletins are available on the U47/48, KM54, KM56, M49B and SM2 microphones. Gotham not only acts as exclusive sales agents in this country for Georg Neumann of West Berlin, Germany, but also offers complete servicing facilities for Neumann products.
• Robins Industries Corp., 36-27 Prince St., Flushing 54, N.Y., announces a new 4-page consumer catalog containing more than 150 audio accessories. Along with the complete Robins line of tape splicers, the booklet illustrates and describes such items as anti-static devices, phono cushions, tape threaders, and turntable covers. Each item is simply described and list prices are shown. Your copy will be mailed free on written request.
• Altec Lansing Corporation, 1515 S. Manchester Ave., Anaheim, Calif., reviews all Altec high fidelity equipment in a new 2-color catalog which will be mailed free of charge. Besides listing equipment the booklet has a number of illustrations of custom monophonic and stereo installations. A special feature is the section which diagrams the proper placement of speakers and other components in a listening room. Described in detail are tuners, preamplifiers, amplifiers, speakers, speaker components, speaker systems, enclosures, and microphones. Requests for copies should specify Publication No. AL-1302.
• Panoramic Radio Products, Inc., 514 S. Fulton Ave., Mount Vernon, N.Y., discusses frequency response and distortion measurements of amplifiers, speakers and other high fidelity equipment in the latest issue of "The Panoramic Analyzer," a periodic publication devoted to application data. Automatic techniques for testing tape and disc recorders and pickups are described. The issue outlines how tedious point-by-point measurements of audio response and distortion can be avoided by the use of an automatic scanning audiofrequency spectrum analyzer. Methods of measuring harmonic and intermodulation distortion and tracing loudspeaker response are explained in detail. Copies of Issue No. 5 of "The Panoramic Analyzer" are available upon written request. Future issues of this publication dealing with other measurements and analysis problems will be sent regularly to those requesting that their name be put on the mailing list.
• Rockford Special Furniture Company, 2024 Twenty-Third Ave., Rockford, 111., is now distributing Bulletin R-14, a booklet on enclosures and cabinets for mono-phonic and stereo high fidelity music systems. This publication gives comprehensive information on the new Rockford all-in-one low-cost stereo console cabinet, chairside equipment cabinet, all-in-one equipment and record cabinet, and semi-back-loaded 8-in. speaker enclosure. Also listed are Rockford modular enclosures. A copy will be mailed free upon written request.
• Harvey Radio Company, Inc., now has available its 1960 hi-fi buying guide. Listed in the comprehensive catalog is detailed information on an extended variety of hi-fi and stereo equipment in all price ranges. Copies may be obtained ¦without charge at the Harvey Sound Department at 103 W. 43 St. in Manhattan.

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