Radio today (Apr-Dec 1939)

SERVICE NOTES A. Berumen at his work-bench Anthony Berumen, owner of the Broadway Radio Shop, 1508 Broadway, San Antonio, Texas, believes in making things handy for himself when he works, in order to save his nerves and time as well. Therefore he has rigged up a special board with holes in it where he can stock tubes for which there is a great call, and this simplifies things when he is testing, etc. Also, he has strung strips of packing wire above and below these tube boards. On the top packing-case wire, tube prongs will fit over very nicely and keep from falling. On the low two wires, also below the tube board, he has small boxes filled with parts, and these boxes rest on the lower wire and against the upper one to keep them in place and handy when Berumen wants small parts, etc. "This arrangement has saved us a lot of time and inconvenience," says Berumen. "No one likes to be getting up from a service bench continuously, to run to get a tube or some small part. Packing-case wire is fairly strong and can be used at the average service bench very nicely in this way." Two Way Television A two-way television system using one cathode ray tube at each end, has been patented by Allen B. DuMont Labs., Inc. The heart of the system is a cathode ray tube using a photo-sen sitive surface and fluorescent screen in the same glass envelope. A common electron gun serves both surfaces, switching of the stream being either manual or automatic. Previous twoway systems involved the use of two tubes, one receiving and one transmitting at each end. RCA to Build and Sell Chanalyst The manufacturing and sales rights to the Rider chanalyst and volt-ohymst have been acquired by the RCA Mfg. Co. from Service Instruments, Inc. This is a step in the RCA policy to minimize obsolescence in the service instrument field by offering universal equipment with a long-range use. BOOK REVIEW Audel's Radioman's Guide Audels Neiv Radioman's Guide ty E. P. Anderson. Price $4. Theo. Audel & Co.. Puolishers, 49 W. 23 St., New York. A new 756 page handbook for the radio-electrician, and student covers the field of land, air, and marine radio, television and modern servicing. A section of the guide devoted to basic fundamentals, provides the necessary background for covering the more advanced material. A series of review questions and their answers tests the reader's progress. The subject of receivers is built up from component circuits to the complete diagram. Automatic frequency control, push button tuning, and remote control systems are explained with diagrams, drawings and photographs. For sound men, there is a chapter on PA systems and phonograph pickups. A section on marine and aircraft radio, including the radio compass, blind-landing beam, and direction finder covers this new and important field. Electronic television systems are well explained and illustrated. Much space is devoted to testing methods and equipment. The wiring diagrams for modern test instruments are shown and series of radio troubles and their cures provide valuable pointers for the serviceman. Jfl£i/5tcU/ Quiet/ Three great engineering features make IRC Controls PERMANENTLY QUIET, DEPENDABLE, RUGGED. All three were pioneered and perfected by IRC. They are available ONLY in IRC Type CS Volume and Tone Controls. Each one involves more painstaking, more costly manufacture . . yet you buy IRC Controls at ordinary control prices. FREE: If you haven't already received your copy of the NEW IRC GUIDE (Edition No. 2) ask your jobber today. The finest, most complete GUIDE ever published. Includes the new IRC Wire Wound Controls, the new IRC Midget Controls and the new IRC universal shafts that save you time and money. Don't miss it! METALLIZED RESISTANCE ELEMENT The ideal surface for amazingly quiet contact. You can actually feel the difference when you turn the knob. SILENT SPIRAL (POSITIVE) CONNECTOR Metal-to-metal, sliding tact between rotor arm and end terminal is eliminated. Noise hasn't a chance. 5. FINGER "KNEE-ACTION" CONTACT Each contactor acts independently. Each tracks smoothly and A unique service bench layout at Herring Radio and Television Service, Columbia, S. C. JULY. 1939 41