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Blue rin ectionorr Every Mont g! sá iiRk ?t gA/ú i 0 0v4 ayèAa: MEET Y FACTS BOOMERANG CRITICISM THE "WHY OF THE SIX" The Silver Six is at once the most satisfactory and the most unusual as described in Radio Broadcast of November and December broadcast receiver ever devised. It is the first practical receiver with Sensitivity, Selectivity Tonal Quality which cannot be surpassed. SELECTIVITY is such that out of town stations and may be brought to Chicago through twelve powerful This can only be understood by a careful study of the receiver's charac- local stations. Selectivity can be regulated at will, teristics as analyzed under "FACTS." from a degree satisfactory for ordinary reception, up to the surprising limit where side -bands arc cut. The Silver Six was put through its paces for a prominent Editor, SENSITIVITY is so great that nothing will sur- pass the Six" except special laboratory-build an Engineer and an Executive just after it was perfected. How super -heterodynes. Either coast may be brought did they react? The Editor asked to have the tuning broadened in to Chicago during the summer months on a small antenna -in many cases on a loop. The Engineer was astonished at the uncanny ability to bring in DX FLEXIBILITY permits the use of antenna or Stations in daylight . The Executive objected to the intensity loop with either detector, one or both stages of with which low on scale were Why radio frequency amplification. Interchangeable notes the musical reproduced. R. F. Transformers, with adjustable antenna coup- did these men react this way? Simply because the Silver Six was not ler, permit operation on all waves from 50 to 550 "just another receiver" of merit easily recognized in comparison with or higher if desired. - existing . But VOLUME is so great as to paralyze any but the standards because it was an accomplishment best loud -speakers. Yet it may be adjusted to any so far in advance of the commonplace that these three authorities had degree by a single knob. to revise their standards in order to appreciate ideal performance - QUALITY cannot be excelled due to resistance coupled amplification. It is the only receiver that not merely in theory -but when the "Six" actually demonstrated it to will bring real appreciation of "cone" speakers. their amazed senses. CIRCUIT consists of two stages of R. F. amplifi- cation with special oscillation control uniformly These men were unable to demand and the "six" fail to produce. Se- effective at all wavelengths, grid- biased detector and three stage resistance coupled audio amplifier. lectivity was at their command -ease of control theirs for the ask- EASE OF CONTROL allows use of one, two or ing -one, two or three dials as preferred-volume adjustable by a three dials at will. single knob from a whisper to a roar without a discordant note - TUBES may be either dry cell or storage battery, rather with a perfect harmony that enthralled the listeners. with UV201 -A's recommended. "B" Battery Consumption at 135 volts is below 10 miliamperes- less than once -third that of other six -tube receivers. What Was Their Verdict? Unqualified Approval! Why? Because ASSEMBLY requires but a few hours, using only Seeing Is Believing. parts supplied in kit. Type 600 Kit including all parts necessary to build $53.00 Mail this Coupon the complete "Six" Type 610 Kit, essentials only, including 3 condensers, Silver- Marshall, Inc., Chicago, Ill. Gentlemen: Please send me 3 inductances and 3 inductance sockets $27.75 A- Complete building data on the Silver "Six," See S -M Products at Your Dealers. for which I am enclosing 50c. B- Descriptive circulars on S-M Products. Name__ ........... ...... Silver-Marshall , í nc. 1 114 South Wabash Avenue CHICAGO * Tested and Approved by RADIO AGE RADIO AGE for November, 1925 The Magazine of the Hour 1 This Catalogue - represents the world's greatest radio store Ward's New Radio Catalogue Is Yours Free Where you buy Radio is equally as im- one station after another by turning a portant as the set you buy. single dial! Send to Radio Headquarters for the Every price quoted means a big saving to Catalogue of the season. you. Everything offered is tested by our own most complete Radio Experts; in fact, the best experts com- See for yourself what is new in Radio and piled this Catalogue for you. has been tested and ap- what actually Write for this free 52 Page Book. It is yours proved. Free. See for yourself what low prices can be -made on Radio when it is sold without Our 53 Year Old Policy the usual "Radio profits." For 53 years we have sold only quality mer- chandise under a Golden Rule Policy. You Radio can rely absolutely upon the quality of every- A Complete Manual thing shown in this Radio Catalogue. This new 52 page Radio Catalogue shows in parts, batteries, cabinets, everything To Montgomery Ward & Co. Dept. 18 -R contains a list of stations, a radio log for recording stations. It shows the best of Baltimore Chicago Kansas City St. Paul sets that give Portland, Ore. Oakland, Calif. Fort Worth the new sets. One tube house nearest you.) amazing results. Five tube sets with a (Mail this coupon to our in Please mail my free copy of Montgomery single dial to turn. Think of tuning Ward's New Radio Catalogue. Name Montgoi eryWard &Co. Local address The Oldest Mail Order House is Today the Most Progressive Post Office Baltimore Chicago Kansas City St. Paul Portland, Ore. Oakland, Calif. Ft. Worth State Tested and Approved by RADIO AGE 2 RADIO AGE for November, 1925 The Magazine of the Hour A Chat With the Editor The Magazine of the Hour Established March. 1922 EDITORS, engineers and manu- WITH WHICH IS COMBINED RADIO TOPICS facturers have combined their efforts toward making "The Volume 4 November, 1925 Number 11 Radio Age Model Receiver" a truly valuable aid to the home set- maker. The description of the circuit, with drawings, photographs and blue- CONTENTS prints, will be published in the December issue. We are giving Cover Design by Anker P. Mehlum the circuit a name which clearly shows that back of this outfit is the A Super-Het without Intermediate Stages 7 indorsement of our engineers and By Roscoe Bundy editors. We do not claim this Riding the Short Waves 11 circuit is a departure from present By Armstrong Perry approved lines of design and con- Directing the Air Mail By Radio. 13 struction. We do not claim that By S. R. Winters it involves any radical improve- A Windless, Pipeless Pipe Organ. 15 ments. We merely assert our con- By J. C. Jensen fident belief that this December A New Low Loss Receiver 17 feature will be the best illustrated By H. Frank Hopkins how -to -make article this magazine Magnetic Theory of Radio Transmission 21 has ever published. By Beecher I. Sheridan All parts used in the construc- On Inductive Radio Interference 22 tion of this set will be listed under How to Make an Efficient Low -Wave Transmitter_ 23 their trade names. This, in itself, By Brainard Foote is a departure for Radio Age. Our RADIO AGE " \Vhat the Broadcasters are Doing" policy heretofore has been to let Studio -Land Feature Section 25 -32 the reader make his own selections RADIO AGE BLUEPRINT Section -Adding of apparatus and accessories. In Radio Frequency Stages 33 -40 this feature article, however, we By John B. Rathbun are going to try to make the in- Late Models at the Chicago Radio Show 42 structions so complete that no Pickups and Hookups by our Readers 43 reader will have to ask a single question further after he has read Corrected List of Broadcasting Stations ....66 -68 -70 the directions. Realizing that in choosing good parts for a five -tube-tuned radio frequency receiver, such as this set, it will be impossible Radio Age is published monthly by RADIO AGE, Inc. to include Member: Audit Bureau of Circulations. all the really good parts which would give satisfaction for a given Publication Office, Mount Morris, Ill. purpose, it is our purpose td follow Address all communications to RADIO AGE, INC. the original artide with others, one Executive Editorial and Advertising Offices 500 N. Dearborn Street, Chicago, Ill. each month, in which there will be changes in various details of FREDERICE A. SMITH, Editor the circuit and in which the list of FRANK D. PEARNE, Technical Editor parts again will contain trade M. B. SMITH, Business Manager names, probably quite a different Advertising Director list in a majority of its items from HARRY A. ACKERBURG the December suggestions. 500 N. Dearborn St.. Chicago. lu. Tuned radio frequency is popu- lar now. We suggest that set - Eastern Representative makers make sure of getting the DAVIDSON & HEVEY, 17 West 42nd St., New York City December issue and follow the Pacific Coast Representative series carefully. V. M. DEPUTY & ASSOCIATES, 515 F. W. Braun Bldg., Los Angeles, Cal. Final Advertising forms close on the 20th of the 2nd month preceding date of issue Vol.4, No. 11. Issued monthly. Subscription price 52.50 a year. November, 1925. Entered as second -class mauer at post office at Mount Morris. Illinois, under the Act of March 3, 1879. / Editor of RADIO AGE Copyright. 19U. by RADIO 40E, loe. RADIO AGE for November, 1925 The Magazine of the Hour EVEREADY HOUR EVERY TUESDAY AT 9 P. M. Eastern Standard Time For real radio enjoyment, tune in the "Eveready Group." Broadcast through Batteries are stations - EVEREADY Radio W EM' New York W CAE Pittsburgh WJAR Providence WSAI -Cincinnati and reliable! W EEI Boston W Wl Detroit always uniform W FI I'h.ladeiphia WCCO Minneapolis W G R Buffalo 1 St.