Radio Broadcast - 1924, January - 84 Pages, 8.2 ... - VacuumTubeEra

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244 <strong>Radio</strong> <strong>Broadcast</strong>tube socket has been added and the new twocoilmounting is indicated on the diagram ing.battery) should be run in grounded lead cover-(Fig. and 1 1) at the extreme left in Fig. 12.Fig. has been drawn Specific instance: Third stage of amplifierwith the 1 1 apparatus possessed a very high (in the upper limits ofshown in the exact position from left to right audibility) squeal, a persistent peanut whistlethat it occupies on the panel. In Fig. 12, note which was more nerve-racking than if it hadthe jack installed at the right in which a loop broken up the signals. All wiring was runmay be plugged. The coils in Fig.1 1(DL-y5o) in lead-covered duplex which was grounded.are both shown in the photo (Fig. 12) as variable,but DL-75O has been found to be the in places, and of the best electrical design.Instruments were perfectly spaced, shieldedproper size.Special telephone cam switches were used forThe installation of the two-coil mounting cutting out amplification stages. As a lastallows the output to be fed to an intermediatefrequencyamplifier.connected together and grounded. The squealresort, the metal frames of the switches werestoppedLEAVES FROM AN OLD !TIMER'SBUILDING YOUR OWN LABNOTEBOOKAmplifier Squeal In The Last Stage: This RADIO BROADCAST'S suggestion forthis month's addition to theannoyance is often encountered buddingin using a thirdstage of audio laboratory is a vise but not of the five and tenamplification, and, occasionally, cent store variety. The experimenter shouldpay about two dollars for the vise. It shouldbe of a reliable, well-known make. It shouldhave steel jaws with at least a two-inch separation.A vise of the recommended type isshown in Fig. 13.The vise is one of the most useful tools in theworkshop, but one that is often the last thoughtof by the average amateur, and it is generallynot added to his equipment for many months,or even years, after he has accumulated lessuseful tools. The uses of this "third hand"are so many that -there is scarcely a bit of radioconstruction in which it will not save time andextra labor, as well as lending accuracy andfinish to the completed work. It will holdpanels for drilling after one or two instrumentsare already mounted: It will hold rods andtubing for threading; bakelite, rubber or woodfor working and sawing; metal strips, etc.,for bending and filing, and many other materialsfor many similar tasks where a slip meansminutes or even hours of additional labor.When used for holding wood, or panel material,for drilling, planing, etc., small blocks ofFIG. 13wood should beA fine vise of the approved type. Note the massiveconstruction, and the two guide bars the material, in order to prevent marring underplaced between the jaws andthe tight grip of the steel jaws.on the second stage. Every metallic object in The vise lends itself to perfect cooperationthe immediate vicinity of the set, but not electricallyconnected to it, should be grounded. The recentlywith the drill, taps and dies which we havehigh voltage wires (those running from the B suggested as additions to the laboratory.RADIO BROADCAST will be pleased to. buy from its readers, at prices from three to five dollars,any kinks, devices, original ideas, etc., with photographs if possible, which the Editor mayconsider eligible for this department. Address all communications to the R. B. Lab Editor.
Alone Before ThousandsAGNES LEONARDWith her ukelele and her charming voice,she sings the youngsters to sleep onFriday evenings from WJZ, New YorkDOROTHY GISHBidding farewell to movie fans who arealso radio fans, just before leaving forItaly to start work on a new picturePARIS HORRORS LOSE NOTHING THROUGH THE MICROPHONE;The Grand Guignol Players, on their tour of this continent, stopped off at Station CKAC, Montreal,and gave one of their most blood-curdling offerings, "Une Nuit au Bouge" ("A Night in a Den")
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Radio Broadcast - 1924, January - 84 Pages, 8.2 ... - VacuumTubeEra

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