Radio age (Jan 1927-Jan 1928)

Jft»tS9$7 RADIO AGE for February, 1927 The Magazine of the Hour The Magazine of the Hour Established March, 1922 Volume 6 February, 1921 CONTENTS FOR FEBRUARY ISSUE Cover Design by A. P. Mehlum Editorials 4 Two Tubes and Regeneration 5 By Armstrong Perry Building the Hammarlund-Roberts (Parti) 7 By Leslie G. Biles Noise Doctors Cure Inductive Static 10 By George A. Barclay Building a 36 Inch Cone at Home 11 How a Variable Condenser Affects Your Tuning , 13 By Kirk B. Morcross Power Six Is An Elaboration of Counterphase....l5 Keeping Step with Science 18 Everday Mechanics 20 Words — Without Music 22 By Dorothy Brister Stafford Building the Browning-Drake Power Receiver (Blueprint Section) 25 By J. E. Coombes Pickups and Hookups by Our Readers 33 February Evenings Skies : 35 By James Stokley Correct List of Broadcast Stations.. 46-48-50-52-54 Log-a-Wave Chart 56 Classified Advertisements ...Third Cover Radio Age is published monthly by RADIO AGE Inc. Member: Audit Bureau of Circulations. Publication Office, Mount Morris, 111. 404 North Wesley Ave., Address all communications to RADIO AGE, Inc. Executive, Editorial and Advertising Offices 500 N. Dearborn Street, Chicago, 111. Frederick A. Smith, Editor F. A. Hill, Associate Editor M. B. Smith, Business Manager Advertising Manager HARRY A. ACKERBURG 500 N. Dearborn St., Chicago, III. Eastern Representative HEVEY & DURKEE, 15 West 44th St., New York, N. Y. Pacific Coast Representative CONGER & MOODY, Sharon Bldg., San Francisco, Calif. CONGER & MOODY, Higgins Bldg., Los Angeles, Calif. Final Advertising forms close on the 20th of the 2nd month preceding date of issue Vol. 6, No. 2, Issued monthly. Subscription price $2.50 a year. February, 1927. Entered as second-class matter at post office at Mount Morris, Illinois, under the Act of March 3, 1879. Copyright, 1927, by RADIO AGE, Inc. Chats With the Editor BUILDING activity has been greater than ever before if the volume of correspondence from our readers is any indication of the virility of the parts business and the human urge to accomplish something constructive and yet entertaining. Especially is this true of the eight tube super which was featured in November and January. For March we are preparing another feature in supers — this one to be known as the Ideal World's Record Model. It is made, tested and described by the staff of the RADIO AGE laboratory. Be sure to get your March copy either by subscribing for the magazine or else putting in your order with the newsdealer. Speaking of supers we have another treat for experimenters with this type of set in a forthcoming series of articles from the pen of D. S. Breitenbach, who is describing the various forms of oscillator tuning, first and second detector detection, intermediate oscillation control and other items dear to the heart of the super experimenter. Watch for these articles in an early issue of this magazine. Cone speaker enthusiasts will find a construction article of interest on page 11 — you'd be surprised to see how easy it is to build a good three-foot cone. And if the wife thinks she is left out of the picture, tell her she may have the pleasure of decorating the face of the cone with an attractive water color design. Or she may even resort to the use of the familiar decalcomanias with which we, as children, adorned our school books. In the blueprint section of this issue will be found instructions for building the Browning-Drake in power form; that is, using a 171 power tube supplied from a power compact which produces the A, B and C voltages for the 171 and the B voltages for the rest of the receiver. Editor of RADIO AGE.