Radio mirror (Jan-Oct 1923)

RADIO DIGEST May 19, 1923 How to Make a Two Electrode Tube Range of Crystal Set Increased with Tube Those who are thinking of replacing their crystal detector with one of the new two element tubes may be interested to know that a very efficient one may be made WORKSHOP KINKS? EARN A DOLLAR— THERE are many little kinks worked out at home that would aid your fellow Radio worker if he only knew about them. There are new hook-ups, new ways of making parts and various unique ways of operating sets that are discovered every day. Radio Digest is very much interested in securing such material. Send them in with full details, including stamped envelope so rejected copy may be returned. The work must be entirely original, not copied. RADIO KINKS DEPARTMENT. Radio Digest 123 West Madison St.. Chicago, 111. cheaply, as follows: Secure an ordinary 3 volt miniature lamp bulb and stick tinfoil all around the outside of the glass tightly with liquid glue, taking care to exclude all air pockets in the tinfoil between it and the glass. A wire is carefully soldered to the tinfoil with an iron which is no warmer than is absolutely necessary for the solder to run. The tinfoil covering is used as the plate in the ordinary two element tube. Even better results can be obtained by immersing the globe in a metal dish of mercury. The mercury is used for the plate. If such an arranged tube is used in place of the ordinary crystal detector, much louder signals and also an increase in range will be the result. Two ordinary dry cells should be used to light the tube filament and the flow of the current should be regulated with a 25-ohm rheostat. A hook-up using this tube is given. Range, 50 miles. — J. K Smith, Chicago, 111. Pilot Lamp for Loud Speaker Different attempts have already been made to attach pilot lights to loud talkers, utilizing the magnetic current so as to indicate the on and off condition. Generally a small 6-volt lamp is used, but it will be found that such lamps only help to drain the storage batteries. I have developed a way to use alternating current to light a lamp. Any type relay can be used for this purpose, but it should be kept in mind that most relays have a high resistance, and it will be necessary to rewind the magnet. The magnet used in this case was a single type core and was rewound with No. 12 ace THE PIONEER TUNING-IN CHART The latest necessity of a radio set in which complete record is taken of your set when tuned in By referring to chart in future, you Immediately know if you can get the station wanted. Room for 24 stations on each chart Don't mark the dials of your set! Use modern methods. Printed on bristol board, elaborately designed, gold bronze border — 25c each ; 5 for $1.00. PIONEER RADIO PRINTERS. 900 Xorth Main St., Ottawa. Kansas. PREMIER 'MICROMETER" VARIOCOUPLERS Satisfy The Most Critical $5.00 COMPLETE WITH DIAL. A HIGHLY SELECTIVE VABIOCOLTLEB having 180-degree orientation and 20 Antenna taps which facilitate very sharp tuning. Wound with No. 21 single silk or black enameled pure copper wire. Eighty tums on stator — fifty-five on rotor. Wave lengths range from 150 to 750 meters. All metal parts brass — contacts positive — stay3 "Put" at any angle. Adaptable for either single circuit or loose coupled tuned plate hook-ups, Bakelite button on each tap wire permitting easy and safe soldering. Our Complete Parts Bulletin on request DISTRIBUTORS — We make a most complete line of Radio parts. Some territory open for live, responsible concerns. PREMIER ELECTRIC COMPANY Manufacturers Est. 1905. 3810 Ravenswood Avenue, CHICAGO, ILL. MINIATURE GLOBE USED AS TUBE FILAMENT PLATE WIRE TO 3 VOLT TINFOIL OR MERCURY MINATORE _ PLATE LAMP YT7AERIAiL *~ZZ PL FILAMENT CONNECTIONS'^ PLATE WIRE §|60TURN ^VOLTS 1|, ^> COIL GROUND magnet wire, with two layers, twenty turns to each layer. Suitable lamps can be obtained for this purpose. A very neat and small lamp will be found in the red bullseye lamps which are used in flush receptacles for heating units or a switchboard pilot bullseye (red. 110 VOLTS AC. TO 1 10 VOLT LAMP 6 V. STORAGE. BATTERYy MAERrnZBMG CURRENT TO LOUDSPEAKERS, green or white). Any kind of a good switch may be used, such as the automobile dash switch or push button kind used in lighting fixtures. — Peter S. Schott. Perth Amboy, N. J. Faulty Audio Amplifiers Faulty audio frequency amplifiers on weak signals, particularly on the first stage, is a common complaint. To begin with the same degree of amplification, should not be expected on weak and strong signals. That is, if with a nearby station the first stage gives an audibility amplification of twenty times, it will give less amplification possibly only doubling the signals of a distant transmitter. This is due to the fact that the output of a tube does not vary directly with the applied E. M. F., but more approximately with its square. Also throwing in amplifying apparatus appreciably alters the receiving conditions of the entire set which in the case of the very weak signals may render them inaudible. Therefore, when tuning is done the set should be slightly retuned when the amplifier is plugged in, especially on the adjustment determining regeneration. SOMETHING NEW A real loud Talking Detector ^ made of "B" Metal. _ 100% i superior to | any crystal, j Puts n e wj life into! your seM Guaranteed for one year. It's the cheapest in the long run. Sold by all live dealers, or can be ordered from the B-Metal Refining Co. 3134 Trumbull Ave. Detroit, Mich. 50c DEALERS! We have complete parts for — Reflex, Reinartz, Flewelling & Ultra Audion Circuits TUBES We have for immediate distribution— U.V.201A, W.D.I 1 W.D.12, and U.V.199 Write for our new discount sheet out May 24th, listing well-known lines at attractive discounts. 159 X. STATE ST., CHKAGO.ILL. Probably the most common cause of such amplification lies in the failure to include a small .001 mfd. telephone shunt condenser across the primary of the first step. It is once more the problem of reducing the positive reactance in a Radio circuit. The inductance of an audio frequency transformer is made very high in order to secure a transfer of audio-frequency energy. The reactance is, therefore, much greater than that of the resistance, which combined with resistance obstructs the passage of the plate current. Many instances of faulty amplification are due to transformer and tube troubles and the experimenter should always make tests to determine just where the trouble lies. Directional Effect An outdoor aerial does not necessarily have to run in any particular direction to pick up a certain station. The directional effect is very slight in most cases. Run the line the way that gives the most "open view," unobstructed by houses, etc. We Live In Kansas — but we receive programs from Atlanta. Minneapolis, Davenport, Fort Worth, Madison. Los Angeles, Dallas. Kansas City, St. Louis, Denver and San Antonio on Crystal without batteries. Your crystal set requires only easy inexpensive changes. Send stamp for farther information or $1 .00 for copyrighted drawings and instructions. Everything explained. Satisfaction guaranteed, LEON LAMBERT. SOI South VoIuUia, Wichita, Kansas Crystal in Grid Lead Aids Signal Strength Some time ago I inserted a crystal detector in series with the grid of my vacuum tube and found that it increased the range of my set about 350 miles. I use a loose coupler and a 23-plate condenser for tuning. I am passing this hook-up along so that it can be experimented with by some other Radio bug to increase their range. — R. Hoffman, Cincinnati, Ohio. REFLEX R. F. TRANSFORMER $3.45 REFLEX AUDIO TRANSFORMER $2.65 HI-VOLTAGE POWER TRANSFORMER $2.95 CALIBRATED FIXED MICA-COPPER BAKELITE CONDENSERS .00015 50c; .001 55c: .015 60o: .002 65c; .0025 70c; .006 90c. VERNIER CONDENSERS WITH DIAL .0005 $2.95 REINARTZ ULTRA TUNER UNIT $5.90 Reinartz green silk spider coils $1.65. Reinartz plate circuit triple ohokes $1.70. AERIOLA, SR. STYLE TUNER UNIT $5.65 For correct voltage on new tubes use Quality master control rheostat and your present rheostat as Vernier. 30 Ohm Bheo. for new low voltage tubes $1.00. 400 Ohm Potentiometer tor reflex & B. F. clr. $1.20. GOVT. SIG. CORPS RADIO BATTERIES Edison BB-4 cells, anv voltage, any capacity. PEANUT TUBES, TINY AEROPLANE STYLE REFLEX— REINARTZ— FLEWELLING SEND FOR LIST QUALITY RADIO SHOP, RICHMOND, IND. ii MAKE PERFECTION YOUR SELECTION" We Carry Only STANDARD Advertised Radio Equipment. | Add 5% on purchases Every Product Sold on a MONEY on^u'rcL"^ BACK GUARANTEE. $IO-for Parcel Post FREE A. $1.25 VOLTMETER OR AMMETER GIVEN WITH EACH I7DCI7 PURCHASE OF 55, OR OVER _»_l\EiEi MAGNAVOX LOUD SPEAKER, Type. R. .3. $27.45 Nathaniel BALDWIN Phones List $6.00. SINGLES, with Cord. jf*y\ f*(\ List $12.00. DOUBLES, with Cord< and Band ' '$9.45 PERFECTION VARIOCOUPLER SILK WOUND. Fibre Base List $5.00. Our Price. . $2.25 N. & K. PHONES. 6006 Ohms None Better Made Imported. List $16.00 $6.50 PERFECTION VARIOMETER, hogany. Guaranteed Quality. List $6.00. Our Special Price $2.95 ACME TRANSFORMERS. Type A 2 S. $5.00 List. . . .<p4.^d MURDON » Guaranteed to be best IVi-Volt Tube made.. -Volt Dry Cell Tubes. $4.95 KLOSNER eqr VERNIER RHEOSTATS. List $1.50. *7*' REINARTZ CIRCUIT. Complete parts /+, + 4 »including Panel. FREE Hkl *!»> DIAGRAM «p **••/»# ATWATERKENT.., Qulffry. A$"'l4'.i(!oarListSUPre.n'0. $1 1 »50 MICA DIAPHRAGMS Improve your phone. List $2.00. Our Price $1.25 THORD ARSON TRANSFORMERS. S4.50 List. A Nationally Known Transformer $3.25 General Electric quality product. $18.00 List— 2 Amp. Special $28.00 ListSpecial $15.75 -5.Am* $23.75 180° BAKELITE COUPLER. Silk Wound. List $5.00. Our Price $2.95 VARIABLE CONDENSERS List Price Our Price 3 Plate Vernier Condenser, moulded .... ends * I-*0' * ',0 1 Hate Condenser, moulded ends. .00025 2.50 PHONE CONDENSERS All Capacities Fixed Condensers, Grid Leaks, etc $0.30 Freshman Variable Grid Leak 75 Freshman Variable Grid Leak and Condenser combined 1 .00 AU capacities of Dubilier Micadons and Freshman Micons in stock. $0.09 43 Plate Condenser, .001 moulded ends. Franco 23 Plate Variable Condenser with Vernier 6.60 Franco 43 Plate Variable Condenser with Vernier 7.70 Our Price $0.25 .60 .60 HONEYCOMB COIL MOUNTINGS Crown Triple Mountings with leads — " screw adjustment $ 5.00 $ 3.95 Double Mountings with leads — screw adjustment 3.50 2.45 PANELS— 3/16" Thick 7x18. 7x21. 7x24. Hard Bubber Bakelite $1.65 $2.45 7x10. .. 1.85 2.75 7xl». ... 2.15 3.25 7x14. Hard Bubber Bakelite ...$0.95 $1.35 ... 1.25 1.60 ... 1.40 1.95 CABINETS Extra fine quality— Hinged top— Mahogany finish. 7*10 $3.25 7x18 $3.95 7x12 7x14 3.40 3.75 7x24 . 12x14 4,25 3.95 SOCKETS List WD-11 Socket $1-00 Bed Bakelite Standard Base 1-00 Brass Tubing Socket 1 .00 VOLTMETERS Sterling Brand 0 to 30 Special ■% 1. 75 0 to 50 Special 2.25 BATTERIES EXIDE "A" Storage Battery. 6 V. 40 Amperes Hours, Tyne 3 LXL5 17.85 14.00 EXIDB "A" Storage Battery. 6 V. 80 __ Amperes Hours. Type 3 LXL9 23.10 19.00 DXIDB "A" Storage Battery. 6 V. 120 Amperes Hours, Type 3 LXL-13 31.50 25.00 Everready "A" Variable Storage Battery—6 V.. 90 Amperes Hours 18.00 15.50 Everready "A" Storage Battery — 6 V., 98 Amperes Hours 18.00 16.00 Everready "A" Storage Battery — 6 V., 110 Amperes Hours 20.00 18.00 Everready "B" Battery — 45 V 5.50 3.95 Everready "B" Battery— 22% V 3.00 2.20 Volton "B" Battery— 22% V 1.75 .95 Bright Star "B" Battery, 22% Volts 1.75 1. 10 Bright Star "B" Battery 3.00 2.00 Bright Star "B" Battery 5.00 3.50 22% V. Variable. 5 Positive terminals 1.75 1. 10 Bus Bar Wire ( 2 ft. lengths) 03 PERFECTION RADIO CORPORATION, 59 Cortland St., NEW YORK CITY Stores also at 119 West 23d Street, 78 Cortland Street and 128 Chambers Street WHOLESALE AND RETAIL