Radio Digest (Oct 1923-July 1924)

RADIO DIGEST — Illustrated tary 9, 1924 OPERATING AND TROUBLE SHOOTING (Continued from page 11) obtained only when the rheostat is turned completely to the right, it is necessary to renew the A batti If battery is vised, see that it s kept well charged and properly filled -with distilled water. The battery solution should always be kept at a level the battery plates. The ideal location for the storage battery and storage-battery charger is in the /.lent. Both battery and charger should be placed on a shelf supported from the first floor joists at such rht that hydrometer readings can be '.i and distilled water added easily. B Batteries B batteries are also a frequent source of trouble. This is indicated by severe cling noises in the headphones, unsatisfactory amplification or the necessity of setting the volume dial abnormally high to produce oscillation (the hissing sound referred to under the paragraph devoted to tuning in distant stations). Whenever these conditions appear, it is well to make a careful inspection of the B batteries and their connections, including a voltage test, which should be made with an accurate voltmeter across the battery terminals. Connecting the battery terminals with a wire to see if the battery "sparks" is very bad practice and quite injurious to the battery. If the voltmeter shows that the battery is much below the rated voltage, it is probably the cause of the trouble. Be sure that both A and B battery leads are connected to the proper terminals, + or — . because if the leads of either are reversed, the set will function very poorly or not at all. Socket Adapters When UV-199 or C-299 tubes are used, the socket adapters may not make good contact to the tube prongs. See that the tube prongs are clean, and, if necessary, bend the adapter contact springs upward to make good contact. Tubes While all tubes are manufactured under strict supervision and inspection, it will be found that one of the three tubes used with the receivers is usually better as a detector than the remaining two. For this reason it is always well to try each one of the three tubes, successively, as a detector and to choose for a detector that tube which functions more quietly and gives clearer reception in general. Dry-battery tubes are designed pri marily to avoid the use of a storage battery, which in some cases may be impractical. However, dry-battery tubes do not give quite so great volume. Tuning Tuning of the Model V is simple. The few operations required for nearby stations (within 25 miles) are: Plug in headphones on stage 1. Turn tube control knob 4 .clockwise until tubes light up. If you are using UV-199 or C-299 tubes, do not turn any farther than necessary to light tubes. If using WD-12 or C-12, turn knob until arrow points straight up. If using UV201A or C-301A tubes, turn somewhat past this point. Set volume dial 2 at 30. Turn tuning dial 1 slowly until you hear voice or music. If signals are loud and distorted, turn volume dial 2 down. If clear, but not loud, turn volume dial up. A small change of tube control knob 4 may now increase the volume or clear up the signal. Burn tubes no brighter than necessary for good reception. Plugging headphones in at stage 2 will, of course, give greater volume than when plugged in at stage 1. For distant stations (over 25 miles), plug in headphones at stage 1. Set tuning dial 1 at 50. Turn tube control knob 4 to point previously found best for local reception. Turn volume dial 2 up until a hiss is heard in the phones. Leave volume dial at a point a few degrees above where the hissing occurs (usually about 40 to 45), and find the carrier wave whistle of a broadcasting station by turning the tuning dial 1 slowly in either direction. With the fine tuning knob 3, get as nearly as possible in the center of this whistle (where it dies out but will come back when fine tuning knob is turned in either direction). Reduce volume control 2 until signal is clear. For best results it is desirable to work the volume and fine tuning controls together at this point, by turning one with each hand. Plugging headphones in at stage 2 will, of course, give greater volume than when plugged in at stage 1, also in this case. Finally, it is often found that advancing volume dial 2 just a trifle will strengthen the signal somewhat — otherwise the volume dial is left alone. Lmimimiiimiiimiiimiiiiiiiiimiimiiiiiiiiiiiiiiiimiiiiimi lc SALE [ 1 1 ■ 1 1 1 1 1 j 1 1 1 1 1 1 1 1 : 1 1 r 1 1 1 c 1 1 1 1 1 1 1 1 1 1 1 1 1 1 f 1 1 1 1 » 1 1 1 1 1 1 c 1 1 1 1 ) i r f 1 1 1 1 1 1 1 1 1 1 »_^ One of Six Large New York Stores wMcm 58 Dev Street New York City Goods shipped C.O.D. Just pay the postman WWYAKtV&SOttOM WRITTEN Mbt/EY-MCK O/ARAHttf Send No Money. We'll Ship A nything C. O. D. lc SALE MAKE 2 SETS FOR PRICE OF 1 SUPERTRON TUBES Type 20 1 A uses 6 volts, type WD 12 uses l'/2 volts. Excellent as detector or amplifier. Draws V4 amp. Oscillate in all circuits. I FOR $6.49. 2 For 6.50 "B" BATTERIES n IVh Variable 2 Reg. $1.75. .$1.29 Reo. 2.65.. 1.99 FOR Reg. 3.00.. 2.19 45 Variable lr Reg. $3.50.. $2.99 .,,-._,, Reg. 4.00.. 3.49 MORE Reg. 5.50.. 5.49 PLUGS 2 Torpedo or Flat. easy adjustment for phone cords. High finish. Perfect contact. For Reg. $1.25. 1 FOR 69c. 70c JACKS Single or Double Heavy Springs — German Silver Contacts. Nickel finish. Reg. 90c. I FOR 59c. 2 For 60c TUBE PROTECTORS Impo ssitile to blow your tubes if you attach these to end of socket for 'A or I amp. tubes. I FOR 49c. 2 For 50c AERIAL WIRE 7 Strand Tinned copper wire gives excellent results on DX work. Reg. $1.00. 1 00 ft. 99c. 200 For 1.00 KRONE PH0NES_ 2200 Ohm's Standard Make. Remarkable Clearness and volume. Can be used with horn. Re«. $6.50. I FOR $5.89. 2Prs. For 5.90 LIGHTNING ARRESTERS Approved by U n d e rwriters. You need these for your set. I FOR 89c. 2 For 90c VARIABLE CONDENSERS 2 Moulded end plates, sturdy c 0 n s t r uction. FOR Perfect align m e n t between plates. lc II Plate... $1.79 23 Plate... 2.09 MORE 43 Plate. .. 2.69 DIALS DeForest Type r> Remarkable Z. value. Knurled !,>-.„ knob with heavy rOK brass bushing. i/i and 1% shafts. | r> 2 inch 39c *■*' V/z inch 44c iinpr 3 inch 54c MUKfc 4 inch 74c D. L. COILS 35—50—75—100 Just the size for Three Circuit. I FOR 69o 2 For 70c TRANSFORMERS Audio Frequency well known standard make. Rati* 4-1. Reg. $5.50. I FOR $5.49. 2 For 5.50 HYDROMETERS Very Accurate. Packed in wooden moisture proof box. Reg. 75c. I FOR 59c. 2 For 60c VERNIER CONTROL For any Dial. Makes a Vernier out of any make condenser. Very efficient. Reg. 75 c. I FOR 49c 2 For 50c SWITCH LEVERS Adjustable Arm. FadaType Knob. Heavy Nickeled arm and collar. Reg. 40c. I FOR 29c. 2 For 30c VARIABLE GRID LEAK Panel Type. Needed for proper results. No solder needed. I FOR 79c. 2 For 80c MOULDED VARIOMETER A r e m a r kabla buy. Green silk wire, pig tail contacts. Can be split. Heavy windings. Reg $6.00. I FOR $5.49 2 For 5.50 RHEOSTATS Any Resistance. Fada Type with tapered knob and secure wire. 6 ohms 49c 30 ohms 59c MORE 2 FOR lc VARIOCOUPLERS 180 Degree Wound on Genuine B a k e I i t • tubing with green silk wire. Reaches 600 meters. Reg. $5.00. I FOR $3.89. 2 For 3.90 SOCKETS Well made in detail. Extra heavy phosphor bronze contacts. Binding post nuts. Metal top.... 49c All Moulded. 59c Wiping Contact ...69c 2 FOR lc MORE Vernier Condenser A beautiful moulded end instrument with tapered dial and knob. Precision made. Delicate adjustment. II Plate... $4.49 23 Plate... 4.99 43 Plate... 5.50 with Dial 2 FOR lc MORE LITZ WIRE Most Efficient A double silk covered wire with 37 stands of No. 38 wire, each strand enameled. Wonderful for Coils, Loops, etc. I FT. FOR 4c. 2 For 5c GOLD BUS BAR Most Efficient. Allows high frequency currents least resistance. Used in finest sets. Reg. 15c I FOR 15c. 2 For 16c POTENTIOMETER Complete with knob and dial. 200 or 400 ohms. The most remarkable buy you ever made. 1 FOR 69c 2 For 70c VERNIER RHEOSTATS The famous TECO complete with bakelite dial. Needed for your detector tube. I FOR 89c 2 For 90c NEUTRODYNE No set has ever made the hit with the Radio fan that the Neutrodyne has. The reason is obvious — the Neutrodyne brings in the distant stations without squeals and without distortion. These are G E N U I N E NEUTRODYNE PARTS licensed under HAZELTINE PATENTS. Beware of unlicensed parts! 3 Werkriteformers (Wound on Bakelite with silk wire) 1 7x24 panel 2 Workrite Neutr-odons 5 Brunswick Sockets 2 Shacton Rheostats 2 Star Transformers I Single Closed Jack I Single Filament Jack 2 .006 Westinghouse Fixed I .00025 Mica with Grid Leak 3 Shacton Dials 3 23 pi. Brunswick . Variables Look over this list' of parts. Compare it with others. Then you will realize what a special price this Is $25.97 Special Shackdx Set Complete Set includes all parts, drilled panel, phones, tube, batteries, aerial equipment, forD-X.!3.1 $1500 RADIO SHACK SERVICE The Radio Shack aims to give you better service than any other Radio House. New Customers are just as valuable to us as Old Customers, as we consider our New Customer an old one in the making. In the same way a small order is just as valuable as a large one, because our Service is so sure to please you that large orders are BOUND to follow. Write for our booklet of unsolicited testimonials from satisfied buyers all over the country. RADIO CONSTRUCTOR FREE WITH EVERY $1 SALE ERLA REFLEX I Erla Reflex No. I I Erla Audio I Erla .001 I Erla .002 I Erla .00025 I Z and T Detector I Erla Socket All other parts and panel included. Special $19.75 niiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiniiiiiiiiiiiiiiiiiiiiiiiiiBiiiiiiii 1 1 1 1 1 1 ■ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 e 1 1 1 1 1 1 r 1 1 1 1 1 1 j 1 1 1 1 1 1 1 1 r 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 iiiiiiiiiuiiiiiiiiiI.?