''. ..RADIO BROADCAST ADVERTISERin testing them. THE CARBON PRODUCTS COMPANY.68. CHEMICAL RECTIFIER Details of assembly, withwiring diagrams, showing how to use a chemical rectifier forcharging batteries. CLEVELAND ENGINEERING LABORA-TORIES COMPANY.69. VACUUM TUBES A booklet giving the characteris-35. STORAGE illustratedbooklet on the care and operation of the storage battery.GENERAL LEAD BATTERIES COMPANY.36. CHARGING A AND B BATTERIES Various ways ofconnecting up batteries for charging purposes. WESTING-HOUSE UNION BATTERY COMPANY.37. CHOOSING THE RIGHT RADIO BATTERY Advice onwhat dry cell battery to use; their application to radio,with wiring diagrams. NATIONAL CARBON COMPANY.rejuvenate53. TUBE REACTIVATOR Information on the care ofvacuum tubes, with notes on how and when they should bereactivated. THE STERLING MANUFACTURING COMPANY.54. ARRESTERS Mechanical details and principles of thevacuum type of arrester. NATIONAL ELECTRIC SPECIALTYCOMPANY.your55. CAPACITY CONNECTOR Description of a new devicefor connecting up the various parts of a receiving set,hard-workedat the same time providing bypass condensers between theleads. KURZ-KASCH COMPANY.<strong>61</strong>. DRY CELLS Information on the construction andtubes!operation of dry cells with a description of the methods usedtube with short oftics of the various types a descriptionwhere they may be used in the circuit. RADIO CORPORA-TION OF AMERICA.77. TUBES A booklet for the beginner who is interestedin vacuum tubes. A non-technical consideration of thevarious elements in the tube as well as their position in thereceiver. CLEARTRON VACUUM TUBE COMPANY.86. SHORT-WAVE RECEIVER A booklet containing dataon a short-wave receiver as constructed for experimentalpurposes. THE ALLEN D. CARDWELL MANUFACTURINGCORPORATION.87. TUBE TESTER A complete description of how tobuild and how to operate a tube tester. BURTON-ROGERSCOMPANY.MISCELLANEOUSNIGHT after night for hours at atime those tubes of yours havebeen hard at it. Now they are getting alittle jaded, in no shape to make goodin the coming months of "not sogood" radio reception. But just plugthem into a Sterling Meter EquippedTube Reactivator, turn on the currentfor a few minutes and your tubes willbe restored to their normal strength.The Sterling Reactivator workswonders with old tubes so long as thefilament isn't burned out.Model R-403 for large and small58. How TO SELECT A RECEIVER A commonsensebooklet describing what a radio set is, and what you shouldtubes, $12.50.expect from it, in language that any one can understand.DAY-FAN ELECTRIC COMPANY.67. WEATHER FOR RADIO AOrvery interesting bookleton the relationship between weather and radio reception,with maps and data on forecasting the probable results.TAYLOR INSTRUMENT COMPANIES.test themfor performancewith the Sterling"Home" Tube TesterKnowingwhat'swrong ismote thanhalf thebattle forthe use of electrical testing instruments in automotive workperfectcombined with aradio description of the cadmium test for storagebatteries. Of interest to the owner of storagereception.BURTON ROGERS COMPANY.And more79. INSULATION Aoften thancomprehensive book giving valuableinformation on all types of insulating material used innot thetroublecomes fromthe tubes.The onlyway to find this out is to have a reliable tubetester on hand when you need it. The SterlingTube Tester tells you at a glance theUSE THIS COUPONexact condition of your tubes. In simpleRADIO BROADCAST SERVICE DEPARTMENTlanguage too. No computations to make.RADIO BROADCAST, Garden City, New York.Just plug in and read "good", "fair" orPlease send me (at no expense) the following bookletsindicated"poor".by numbers in the published listModel R-411 for large tube $7.50for small tube $8.50See your dealer about these two essentialradio devices.I1RADIO NECESSITIESSend for booklet "7" tellingName. .Addressabout the complete line of(Number)(Street)Sterling <strong>Radio</strong> EquipmentTHE STERLING MFG. Co.(City)(Stat.')38. LOG SHEET A list of broadcasting stations withcolumns for marking down dial settings. 0. S. L. RADIO,INCORPORATED.41. BABY RADIO TRANSMITTER OF QXH-QEK Descriptionand circuit diagrams of dry-cell operated transmitter.BURGESS BATTERY COMPANY.42. ARCTIC RADIO EQUIPMENT Description and circuitdetails of short-wave receiver and transmitter used inArctic exploration. BURGESS BATTERY COMPANY.43. SHORT-WAVE RECEIVER OF QXH-QEK Completedirections for assembly and operation of the receiver.BURGESS BATTERY COMPANY.44. ALUMINUM FOR RADIO A booklet containing muchradio information with hook-ups of basic circuits, withinductance-capacity tables and other pertinent data.ALUMINUM COMPANY OF AMERICA.45. SHIELDING A discussion of the application ofshielding in radio circuits with special data on aluminumshields. ALUMINUM COMPANY OF AMERICA.73. RADIO SIMPLIFIED A non-technical booklet givingpertinent data on various radio subjects. Of especial interestto the beginner and set owner. CROSLEY RADIO COR-PORATION.74. THE EXPERIMENTER A monthly publication whichgives technical facts, valuable tables, and pertinent informationon various radio subjects. Interesting to the experimenterand to the technical radio man. GENERAL RADIOCOMPANY.75. FOR THE LiSTENER-^-General suggestions for theselecting, and the care of radio receivers. VALLEY ELECTRICCOMPANY.76. RADIO INSTRUMENTS A description of variousmeters used in radio and electrical circuits together with ashort discussion of their uses. JEWELL ELECTRICAL IN-STRUMENT COMPANY.78. ELECTRICAL TROUBLES A pamphlet describingelectrical work. More for the technical man than for theaverage set owner. MITCHELL-RAND MANUFACTURINGCOMPANY.ORDER BY NU<strong>MB</strong>ER ONLYThis coupon must accompany every request. RB 527UsePoforat fullSimply adaptto your set withConnectproldsFor UX 171, and UX 112 Tubes, Na-AW 112Connectoralds are recommended for maximumvolume with storage battery sets. These tubeswill deliver without distortion several times thevolume of the regular 2OI A. Price $1.50.120 Tubes in UV 2OiA sockets, the Na-Ald No. 1 20 Connectorald should be used. Toconvert a storage battery set to drybatteries withi^ample loud speaker volume, use a UX 120 tube inthe last audio stage with the 1 20 Connectorald andUX 199 tubes with 4igX Adapters in the othersockets. Price $i 25.~ vfviFor the UX 120 Tube in UV 199 sockets, ampleloud speaker volume without distortion itobtainable from any set equipped for UV 199tubes by means of the UX i2Oor equivalent tubewith the Na-Ald No.J92O Connectorald. Thetube is raised slightly, but provides for its use inmost sets with limited headroom. Price $I.2JJ.For UX 120 tubes in the UV 199 sockets ofthe <strong>Radio</strong>la Superheterodyne Semi- Portable,and <strong>Radio</strong>la Super VIII. These excellent Superjheterodynes will deliver ample volume for loud|speaker operation when equipped with theUX 1 20 Iused with the Na-Ald No. 420 Connectorald. Price $1.25.!ALDEN MANUFACTURING GO.Dept. B-25Springfield, Mass.To get the utmostfrom those new High-Mu tubesDESIGNED to official specificationsfor usewith the new <strong>Radio</strong>tron and CunninghamResistance-coupled High-Mu tubes, the newLynch Metallized Resistance Coupled AmplifierKit will give you perfect tone with full volume.<strong>May</strong> be used with any receiver. At all gooddealers' or by mail, prepaid $9.00. Write forliterature.ARTHUR H. LYNCH, Inc.Member RMA250 West 57th St. New York, N. Y.This is a good time to subscribe JorRADIO BROADCASTThrough your dealer or direct, by the year only $4.00DOUBLEDAY, PAGE & CO. GARDEN CITY, NEW YORKType A$28.50Not a traceon thePACENTCONEEvery note everyword is true andfaithful in reproduction.PACENT RADIO CORP.156 West 16th Street New York
RADIO BROADCAST ADVERTISER 71TfcPower tubeamp. IP 2O1%iocKeti<strong>Radio</strong>'s sensationalwithoutstartling than the new ZP 201 A,oxide filament, 14 amp. PowerTube the Zetka Process powertube for every stage.Now for the first time, can power tubesbe used in every socket of your set. Now additional C's but what an improvementin tone, in volume, in sensitivity.you can enjoy real power. And withoutchanging a single wire!Only $2.50 each at your nearest dealerReplace your old 201 A's with a set ofputsthese new ZP a complete Power tube set well within201 A's and enjoy the moststartling achievement your radioin tube budget. And then, and thenhistory.only, you'll enjoy real radio satisfactionThe current drain is small in bothA with power tubes of longer life, thatand B it is not necessary to hook up increase in efficiency as you use them.developmenthas seen nothing moreAsk your Zetka dealer tometer test.show you the Zetka WestonYou'll want nothing but Zetka thereafter.YOUR SET DESERVES THIS FINEREQUIPMENT PRICES NO HIGHERZETKAThe Clear Glass Tubere-wiringyour setZETKA LABORATORIES INC.73 Winthrop Street Newark, New Jersey
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RADIO BROADCASTVOLUME XIMAY, 1927,
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INDEX.ContinuedPAGEThreshold of Hea
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RADIO BROADCAST ADVERTISERALUMINUMB
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RADIO BROADCAST ADVERTISERfIA REALA
- Page 9 and 10: :RADIO BROADCASTVOLUME XI NUMBER 1M
- Page 11 and 12: MAY, 1927WITH MACMILLAN TO THE ARCT
- Page 13: THE MARCHInterpretation of Current
- Page 16 and 17: 18volved the law in precarious lega
- Page 18 and 19: The ElectricalA Non-Technical Expla
- Page 20 and 21: 22 RADIO BROADCAST MAY, 1927type of
- Page 22 and 23: A Balanced Short-Wave ReceiverA Des
- Page 24 and 25: What About the A BatteryThe Importa
- Page 26 and 27: 28 RADIO BROADCAST MAY, 1927The cas
- Page 28 and 29: 30 RADIO BROADCAST MAY, 1927NO STRA
- Page 30 and 31: 32 RADIO BROADCAST MAY, 1927from th
- Page 32 and 33: 34 RADIO BROADCAST MAY, 1927the ave
- Page 34 and 35: AS THE BROADCASTER SEES ITDrawings
- Page 36 and 37: 38 RADIO BROADCAST MAY, 1927Interes
- Page 38 and 39: Some Facts About Coil DesignThe Osc
- Page 40 and 41: 42 RADIO BROADCAST MAY, 1927Shows e
- Page 42 and 43: 44 RADIO BROADCAST MAY. 1927The fil
- Page 44 and 45: ''Measuring TubeCharacteristicsA Pa
- Page 46 and 47: 48 RADIO BROADCAST MAY, 1927MUTUAL
- Page 48 and 49: 50 RADIO BROADCAST MAY, 1927whose b
- Page 50 and 51: RADIO BROADCAST ADVERTISERThe Radio
- Page 52 and 53: 54 RADIO BROADCAST ADVERTISERA Bett
- Page 54 and 55: 56 RADIO BROADCAST ADVERTISERNo. 94
- Page 56 and 57: .58 RADIO BROADCAST ADVERTISERTJour
- Page 58 and 59: 60 RADIO BROADCAST ADVERTISERMire's
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