Radio Digest (Oct 1926-Jan 1928)

^w^^^^w^ lVUVVHWil , If LI mf RULES & REGULATIONS (Continued from pag I year; four i-year; pan; mco mail subscriptions direct.. 12.00 TSO votes • ar: Ave 1-year: one and one 3 onc 1 year; on< i and on' paid in advance mail •riptions dir I 000 votes .ir and oi two advance mall lions dir I 30.00 2.500 votes the purposes of the contest the Ur.. divided Into ill comprise the sixth t number on< . known as 11 include the states of Sin .in. Massa chu Lhode Island, Connecticut, New nsylvnnia. Delan: .r.d. and District ot" Columbia. number two. known as the S '.'Til." will comprise the states of Virginia. West Vlrg North and South • ruia. Florida. Louisiana, Mis:ppi. Alabama. T. Arkansas, and Ke: ' imber three, known as tDDLE-WEST," will include the Indiana, Illinois. Michigan. Minnesota. Iowa. Missouri. District number four, known as the II comprise the states of North and South Dakota. Nebraska. Kansas, Oklahoma. ' iiia. Wyoming, Colorado, and New Mexico. District number known as the PAK WEST." will coi. states of Idaho. Arizona. a, Nevada. California, Washington, and .■on. District number six, known as Canada, will comprise the entire Dominion of Canada. 6. The orchestra polling the highest number of votes of all six districts will be declar. d THE WORLDS MOST POPULAR MESTP.A and will be awarded a golden plaqu--. After the grand prize win llmlnated the orchestra polling the highest vote in the district in which they ■ d will be declared to be the "I.AR of their district and each awarded a silver plaque. No orchestra is •■< more than one prize. 7. In the event of a tie for any of the priies offered, prizes of identical value will be given to each tying contestant. B, Any question that may arise during the contest will be decided by the Contest Editor, and his decision will be final. Farrand Junior Speaker in Oval Style for 1927-28 One of the most popular models of the line of .quality loud sneakers produced by rrand Manufacturing Company has always been the Junior model, which contains all the advantages and constructional features of the larger models except the size. The new Oval Junior, being distributed now for the 1927-28 season, is of exceptional value, embodying the new Laminated driving unit for tonal purity With the famous Parrand unlimited tone radius. That this purity of tone over the entire frequency scale is possible at maximum volume is truly an exceptional feature in a popularly priced model. Approximately 13 by 19 inches, this model is by no means a midget in either size or performance. The beautifully proportioned oval in a rich leather motif is mounted on an elegantly proportioned bronzed base, and the beauty of the ensemble is enough in itself to make this model Oi e of the "best sellers" of the Radio season. SeTF Adjusting/ For best performance your tubes require a variable filament control to supply the definite current they need, despite "A" battery varia tions. AMPERITE is the only self-adjusting and automatic filament tube control that does this. Takes the "guess," inconvenience andunsightliness out of panel rheostats. Simplifies wiring, panel design, and tuning. Prolongs tube life. " :.Pr /all Write for f REE "AMPERITE BOOK" of sea Order by name. Accept nothing else, JPriceS 1.10 mounted (in U. S. A.) For sale by all dealers. son's best circuits and latest construction data. Address Dept. R. D. U. RADIALF. COMPANY SO Franklin St., New York Jhz "SELF-ADJUSTING"/?/^/^ Beautiful New Console Models to Suit Every Taste and to Accommodate any Receiver The Excello Line is modern in type and incorporates the latest features of convenience and utility Special filler panels are furnished without extra charge so that any Excello Console will accommodate Atwater Kent, Fada, Freed-Eisemann, Kellogg, Erla, Stromberg-Carlson and all other standard receivers. Confusing vibrations so common when a cone is enclosed are entirely eliminated. Consoles of this type come with or without horn speaker of long air travel type and will accommodate a 22-inch cone type speaker as well as batteries, Gharger or eliminator. Style R.31 smart designs delight all radio fans and add lutiinl piece of furniture to the home. Cabinet ello quality. Doors, 5-ply Butt Walnut, piano finish. The Excello Line also includes Wall Consoles with the tone chamber above the receiver space and ample room below for all accessories. mplete catalog showing wide variety of Excello ' ' FREE on request Write . our copy today. Style R-31 opencl to show the I'if.-alion nl set compartment an') Bound chamber with long ait travel type horn and accessories Excel At jr'.ur -U. \s*.\ for th< trade mark. \Zs 7&dio Consoles Dealers and distributors, write i 0 r franchise offer on o i»o n territory. EXCELLO PRODUCTS CORPORATION 4828 West 16th Street Cicero, Illinois (Suburb of Chicago) Transformers Two additions to last year's Radio Sensation The Amazing Achievement in Audio Amplifications Designed to fulfill the exacting requirements of set builders who demand H. F. L. C'16 Audio Transformers and C-25 Output Transformer — New companions of a Great Unit, will work in any circuit and improve any radio set. H. F. L. Facts H. F. L. Units have been used, approved and most highly endorsed by Radio News, Citizens' Call Book, Radio Review, Radio Age, Radio Engineering, Radio Mechanics, Chicago Evening Post, the Daily News and others. Thousands of engineers and fans, who have turned to H. F. L. Units for better reception, hail them as the finest transformers known to Radio — unexcelled for Power, Selectivity and Purity of Tone. Perfectly matched, skillfully designed, carefully made, rigidly tested — in a word, H. F. L. transformers are technically correct to the minutest detail. All H. F. L. transformers are designed for baseboard mounting or invisible subpanel wiring — each unit is enclosed and sealed in a genuine bakelite moulding. H. F. L. Units are easily connected into the assembly, simplify set construction, and make a beautifully finished job. < EFFICIENCY SENSITIVITY PRECISION AND HIGH QUALITY > The new C-16 and C-25 Transformers will work in any circuit and will improve any Radio Set. H, F. L. Units Give Wonderful Clear Reception Engineers acclaim H. F. L. C-16 a marvellously efficient Audio Transformer. It carries signals at highest volume and lowest amplitude without blasting or developing harmonies. Operates with all power tubes as well as standard tubes. H. F. L. C-25 Output Transformer handles the voltage output of power amplifying tubes, at the same time matches the impedance of the average speaker to tubes. Protects loud speaker unit without reducing plate voltage. Mechanical features of these two transformers are: A coil designed and treated to exclude moisture and withstand heavy electrical surges without breaking down — complete magnetic shielding to avoid interstage coupling — terminals brought out so as to insure short leads. Endorsed by America's Leading Engineers — Guaranteed by the Manufacturers PRICES No. H-210 Transformer $8.00 No. H-215 Transformer 8.00 No. C-16 Transformer 8.00 No. L-425 R. F. Choke 5.50 No. L-430 R. F. Transformer 5.50 No. C-25 Output Transformer. . . . 8.00 Set Builders — Dealers If your jobber cannot supply you with H. F. L. Transformers, wire us for name of nearest jobber. High Frequency Laboratories 133-S NORTH WELLS STREET, CHICAGO, ILL.