Radio mirror (Jan-Oct 1923)

Record Details:

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RADIO DIGEST April 28, 1023 ARRANGEMENT MADE BY KAUFMAN SHOWN 6U-= OOI 45 V, CONSIDERABLE interest is being aroused in Radio circles throughout the East over the efficiency of the new Kaufman Circuit, originated by Wolff Kaufman. This circuit is illustrated as hook up Diagram R. D. 82. At first glance, no especial differences are noted in the circuit. Actually there are two distinct departures from the usual form of circuit. First, the plate circuit feeds through the primary tuning inductance before passing through the receivers to the opposite side of the plate battery. In series in the plate circuit and the antenna lead, is added a single layer inductance consisting of 80 turns of No. 22 cotton covered wire wound on four inch tubing. The last 20 turns are tapped at every turn. This tapped switch connects to the antenna side while the tapped side of the coil connects to the plate of the tube. The untapped end of the coil with a condenser in series connects to the grid side of the secondary of the variocoupler. In addition, a variable grid leak is added from the grid of the tube to the lead, connecting this condenser and the tapped coil. Considerable experimentation and analysis is taking place in this circuit to determine the exact theory of operation. On the surface, we have obviously a form of regenerative feed back which may be compared somewhat to a reflex idea in which the plate energy not only feeds to the primary circuit and thus re-enforces its power, but in addition feeds directly back through a capacity and inductance coupling to the grid circuit. It will be noticed that the capacity coupling between this plate and grid circuit has a very low value and apparently the most effective control of this grid feed back is by means of the variable grid leak. Although the circuit is new apparently on the surface, it is but a combination of various developments and ideas that have been presented in the past and due credit should be given to the originator for the time and patience required in developing it to a practical stage. Undoubtedly the circuit affords unlimited possibilities of still further development along this line and it is quite apparent that more will be heard from it from time to time. FLIVVER SUPER SET (Continued from page 15) Use about No. 22 wire of double covering, either cotton or silk. Do not use single covered wire or enameled wire. Begin and wind 130 turns of wire on the tube, taking taps off from the 50th. 85th, 100th, 115th and 130th turn. This gives us six taps that may be chosen on the winding. These will be found to be plenty. No attempt should be made to pick out single taps. Do not shellac the winding. Depend upon tightness of the winding to hold it in place, and if necessary to use a binder, use nothing but collodion. The rotor ball should have from 100 to 125 turns upon it. This constitutes the heart of the Flewelling receiver and inasmuch as space is limited, more details of construction will be given in the second article of this series, to appear next week. Which Side Is Positive The positive side of a battery is that from which current flows to the external circuit. Negative is the return circuit to the battery. This applies only in direct current. TWO SUPERSENSITIVE CIRCUITS (Both Copyrighted) My Highly Improved Reinartz brings in all important stations on both coasts and Mexican border, loud, clear and without distortion. We dance to music from Atlanta received on one loud Baldwin unit. Build one of these wonderful sets from my blueprints and specifications, price 50c, or with a perfect and complete double wound spiderweb coil, J3.OO by mail. No other windings used. Photo of my set on a glass panel with every order. This copyrighted circuit is the most successful of any Reinartz modification yet produced, and is imitated the most. Thousands axe in use. My W. D. 1 1 Circuit is especially designed for use with the "Pickle" tube and brings out the full value of that little tube as no other circuit can. Stations 1000 miles away come in clearly on one tube. This set is small, complete, portable. For the man who wishes the highest efficiency, this is the set to build. Price of blueprint and specifications, 50c, or with complete and perfect windings, $3.00. Photo of set with every order. Either set is easy to build, easy to operate. Everything clearly shown. These high Quality silk insulated coils are machine wound on fiber forms. I wind coils to your specifications in lots of 100 or more. Write for prices. S. A. TWITCHELL 1925 Western Ave. Minneapolis, Minn. REAL RADIO BARGAINS VARIOMETERS: Ferl (Revolving stator) $2-25 , Raysol (Kiln dried parts) 2.50 Atwater-Kent Special Price VARIOCOUPLERS : Raven (Greensilk wound) 1.55 Eastern greensilk wound 1-80 Queens (180 degree) 2-50 Moradio (Cotton covered) 2.25 Moradio (Enameled) 2.00 Eastern Long Wave coupler (150-3200 meters) 7.25 Atwater-Kent Special Pr. CONDENSERS: . Regal 43 pi. .001 mfd. Cap 2.65 Regal II pi. .00025 mfd. Cap 1-65 Oubllier condensers, all types and capacities including Variadons, in stock Special Price American Bell 43 pi. with Vernier 5.50 American Bell 23 pi. with Vernier 4.50 Malone-Lemmon 23 pi. Vernier 6.00 Malone-Lemmon 43 pi. Vernier 7.00 Arrow 23 pi. Vernier 4.25 RHEOSTATS: Regal (High quality 8 ohm) 85 Klosner Vernier -JS Paragon Standard »■«■ Framingham -JO Bradleystats '-85 Roberts (6 ohm standard) .70 General Radio (Any and all resistances) Special Pr. Radio Corp. Specia Pr. Fada Special Pr. POTENTIOMETERS: Radio Corp. PR 536 (200 ohm) Special Pr. General Radio (400 ohm) Special Pr. Atwater Kent Special Pr. Framingham (200 ohm) .10 Paragon (200 ohm) 1.60 Amsco (150 ohm) 1.10 Bradleyometer, 400 ohms 3.00 SOCKETS: Regal (all nickeled) ••••;•• -■?. Bell (Moulded Bak. Panel or Base Mounting).. .90 Rameco (Fine quality) 40 Turney (All metal fine finish) 25 Do Forest (Moulded) Special Pr. General Radio Special Pr. Radio Corp. (UR 542) Special Pr. Double (Fada) Special Pr. Triple (Fada) Special Pr. WD II (Rameco) 40 WD II (Bell Panel or Base Mtg.) 90 TRANSFORMERS (Audio Freq.) : Betts & Betts (13 to I Ratio) 5.50 Amortrans (Best transformer on market, limited supply) 7.00 Radio Corp. UV 712 Special Pr. TRANSFORMERS (Radio Freq.): Tricoil (of Subway Reception fame) 1.50 Radio Lab. RT-I (Limited supply) 3.90 Murad T-ll (Old standard) 3.80 Radio Corp. UV 1714 Special Pr. DIALS: Kesco 3'/2-in. Moulded $0.30 Kesco 3-in. Moulded 25 Kosco 2-in. Moulded 25 American Hard Ruber 3-in 75 American Hard Rubber 4in 85 Eleotrose 4-in. Fada Knob 75 Emaloid 3-in. Unbreakable 35 Emaloid 2-in. Unbreakable ' 25 PANELS (Bakelite): (Knockdown for immediate assembly) 7x10 $3.60 7x10 $1.40 7x12 3.85 7x12 1.65 7x14 4.15 7x14 1.95 7x18 4.50 7x18 2.50 7x24 5.25 7x24 3.35 HEAD TELEPHONES: Baldwin (Single Units) Gen. Type "C" 6.00 Western Electrics (Type 509 W) 10.00 Frost (2000 ohm) 5.00 Brandes Superior (2000 ohm) 6.20 Telephone connectors for Three pair phones. . . .95 TUBES: Meyers Hi-Mu (Last lot) 4.35 All Standard Tubes in slock at Special Pr. Murdon Vi Volt Detec. and Amp 4.75 BATTERIES ("B" only): Volton 22 </, V. Small size 90 Volton 22'/2 V. Medium size 1.14 Volton 22'/2 V. Large size 1.55 Volton 45 Volt 1.98 MISCELLANEOUS : Phonograph Attachments "Y" Shape 1.25 Radiophone Adapter (Rubber) .2.00 Solderette (Soldering iron to attach to standard plug) 1.50 Single Cct Jacks 25 Double closed Cct Jacks 35 Telephone plugs 65 Telephone Mugs (for two phones) 70 Vernier Dial adjustments 40 Brach Indoor Lightning Arrester 1.25 Argus Lightning Arrester 1.00 Bus Bar Wire Perft.015 Spaghetti (Any color) Per Igt. .08 Reinartz Spider Web Coil 1.75 All De Forest DL Coils at Special Pr. De Forest Triple Coil Mounting Special Pr. Single Coil Mounting 45 Double Coil Mounting 2.25 Triple Coil Mounting 3.25 We also ferry in stock at all times all parts for Flewelling, Reinartz. Reflex and Hazeltine Neutrodyne Circuits. Write for prices. Also plans and instruction for completion and successful operation of Armstrong SuperRegenerative Receiver. Parts for this also ready for immediate shipment. Mawhinney Blueprints — complete set $2.00 All merchandise guaranteed by both the manufacturer and ourselves. Will be shipped upon receipt of purchase price. Orders of not less than $5.00 sent prepaid east of the Mississippi River — all others must include postage. RADIO & MECHANICAL TRADING CORPORATION 23 WARREN STREET, NEW YORK CITY Reviews of Books Ideas for the Radio Experimenter's Laboratory. By M. B. Sleeper. This book tells in a simple way the how and why of Radio apparatus. Comprehensive data is given on such necessary laboratory instruments as the oscillator, wavemeter, direction finder, Radio compass, Vacuum tube characteristic measuring set and detailed advice given on the winding of various kinds of standard inductance coils. Price, 75 cents. The Radio Amateur's Handbook. By A. Frederick Collins. A new revised edition of this book is just out. It is complete, authentic and informative work on Radio. Fully illustrated. Price, $1.50. The Armstrong Super-Regenerative Circuit. By George J. Eltz, Jr., E. E. This is a De Luxe edition of this famous circuit. Profusely illustrated and fully explained. Fifty-two pages. Price, $1.00. How to Retail Radio. A new book telling of tested plans and methods and policies for the dealer in Radio. Financing, location, store equipment and arrangement. Price, $2.00. Radio Experimenter's Hand Book. By M. B. Sleeper. This book will help in the selection and the construction of simple CONGRESS RADIO CO. 503 So. State St., Chicago, 111. Brandes Superior Phones $5.95 Baldwin "Mica Diaphragm" Units 4.65 Master Baldwin Headsets 7.25 Grebe Type Dials, Z and 3 inch 25 |V. T. Composition Socket .37 Glass Enclosed Crystal Detector 40 Fada Switch Levers 25 CRL Adjustable Grid Leaks 1.20 CRL Leak and Condenser 1.70 CRL Rheostats, 75c List .45 Burgess Large 22*4 volt B Bat 2.45 90 degree Variocouplers 1.10 3Plate Variable Condensers 1.00 ,11-Plate Variable Condensers 1.25 23Plate Variable Condensers 1.45 43-Plate Variable Condensers 1.65 23-Plate Vernier Condensers 3.35 43-Plate Vernier Condensers 3.75 Mahogany 7-18 Cabinets, silver hinge. . . 4.50 Federal 2200 Ohms 5.00 Mail Orders Receive Immediate Attention EVERYTHING GUARANTEED AS REPRESENTED apparatus for transmission and reception of Radio telegraph and telephone signals. Price, $1.00. Lefax Radio Handbook. A loose-leaf handbook. This book never grows old or out of date. All of the latest apparatus and hook-ups are added as time goes on. Anything that grows old is taken out and new leaves substituted. Price, $3.50. Radio for the Amateur. By A. H. Packer and R. R. Haugh. The underlying principles of Radio thoroughly explained i:* simple language and understandable illustrations. This book will teach you how to construct and operate a receiving set successfully. Price, $1.50. The book department of the Radio Digest is prepared to send you any of the hooks on Radio published, whether listed in our Book Review or not. Let us know and we will see that the book is mailed to you. Forstage stamps in payments for books not accepted. Send money order or check. Radio Book Department, Radio Digest, 123 W. Madison St., Chicago, 111. NOTICE! By Popular Demand We Are Continuing * Our Specials for One Week More ITEMS OF REAL VALUE $5.00 Ames Audio Transformers, <f»0 AC! 4-1 3>Z.i70 5.00 Acme Trans <j»0 AC formers «pO«TfO 8.00 4000 Ohm Phone with <JJO Qfi Headband Plug ip4t%J%J 2.0O 60 Turn Tapped Coil for O C new Greene Circuit uOC 9.00 Potter (hi l-fk Phones «J>4o5U 15.00 Sor sine (h/-» wp Tunits «pD./0 Bakelite Panel.. iy, per sq. inch Every Item Guaranteed Perfect and Original WILLIAMSBURG RADIO SUPPLY CO., INC. 801 Flushing Ave. Brooklyn, N. Y. Stagg 1707 Radio Bargains We have just purchased the entire stock of a large radio corporation and to clean it up quickly we are offering the following items of standard equipment at less than dealers' cost. VARIOMETERS $ S.S0 Pre9to (no capacity) $3.75 10.00 Remler Mounted 7.50 S.50 Panel Niehoff R. E. S ,. 3.75 VARIOCOUPLERS $12.00 Remler Mounted, 180° $8.50 4.00 New York. 90° £95 S.50 Presto, 90* 3.75 4.50 Westrad, 180° 2.95 5.00 R. E. S, 180° 3.50 4.75 Fada, 180° 3.50 4.00 Signal, 90° t9S SOCKETS 60c Signal WD 11 .45 50c Corona Porcelain 25 50c Star, fibre and nickel .30 75c Red Moulded Bakelite ... .49 RHEOSTATS $1.50 Microstat Vernier , $1.10 1.00 Hipco for Amplifiers .65 1.25 C. R. L. Vernier 90 .75 C. R. L. Plain .49 1.00 R. E. S. for Amplifiers .65 STORAGE BATTERIES $20.00 Yale 60 hour capacity $15.00 24.00 Yale 90 hour capacity 17.00 28.00 Yale 120 hour capacity 19.90 32.00 Yale 150 hour capacity 22.00 20.00 Everready 110 hour capacity 16.00 18.00 Everready 90 hour capacity 14.50 ANTENNA EQUIPMENT $0.50 100 ft. No. 14 Bare Copper $0.39 .85 Lead-in Tubes, 12 inch 50 .50 Porcelain Lightning Switch .30 3.00 Brach Outdoor Lightning Arrester 2.10 2.50 No. 14 Weatherproof Lead-in Wire, Per C 1.75 1.00 U. S. Signal Corps Antenna Cable (4 Strand Tinned Copper, 3 Strand Tinned Steel) .65 .10 Porcelain Strain Insulators 07 .15 Large Type Insulator 10 PHONES $6.00 Frost 3000 Ohm $4.95 5.00 Frost 2000 Ohm ; 3.95 8.00 Brandes Superior 5.95 5.00 Red Star 2400 Ohm 3.50 9.00 Dictograph S.9S MISCELLANEOUS $8.50 Remler Detector Panel $5.95 9.00 Remler Detector Panel 6.50 6.00 Remler Detector Panel 4.50 1.25 Remler Potentiometer (with switch) .90 .06 Nickel Binding Posts— 2 for .05 .55 Remler Grid Leak and Condenser.. JO .40 Tin Foil for Shielding 25 .05 Square Tinned Busbar Wire, foot .02 .75 Dayton Bakelite Dials, 3 inch 49 12.00 Atwater-Kent Circuit Tuner (mtd.) 8.90 EXTRA SPECIAL — With each $15.00 order for above goods, we will sell one genuine WD 11— iyz Volt Tube-^for $5.00. ONLY ONE TO A CUSTOMER. All goods are standard, well known products, and are guaranteed. Your money refunded if you are not perfectly satisfied. RADIO SALES CO. Box 361, Dept. A-3 CEDAR RAPIDS, IOWA