Radio Digest (Oct 1923-July 1924)

^" 10 RADIO DIGEST — Illustrated March 29, 192k OPERATION, TROUBLES a 9) ad that number 40 gives the upper left pointer >er 1 between 40 and 50. number 3 in the sition and number i between *ero and ting number 6 at zero, turr. »Wly with the vernier until your whistle is heard. After clearing up tive, (+) pole of the left-hand battery. The green and red wires are variable connections. The red wire or detector lead is usuallv found to operate best on the 22%volt tap of the right-hand battery, but may be varied down to 16%-volts, dependingupon which tap the best results are obtained. The green wire or radio frequency lead should be connected to the positive ( + ) 22ii-volt tap of the 22%-volt the whistle and obtaining signals, the volume can be increased by very slight adjustments of numbers 1, 2. 3, 4, 5 and 8. Hook-Up of B Batteries Connect the batteries in series, negative or minus ( — ) pole of battery to the positive or plus (+) pole of the next battery. The four colored wires found in the battery compartment of the cabinet are the B battery wires, and are hooked up as shown in diagram. In all combinations of batteries the white wire is attached to the ( — ) minus pole of the right-hand battery and the blue -wire to the posi battery next. This wire also may be varied to higher or lower voltages, according to results obtained. A Batteries The two long red and white wires leading from the back of the cabinet are the A or storage battery connections. Attach the red wire to the positive (+) pole and the white wire to the minus ( — ) pole of the A or storage battery. Test your A battery frequently to see that it is not below 1200, and that the plates are covered with water. (ANOTHER SET NEXT WEEK) De Forest DV3 Dry Cell Tube $6.50 De Forest DV3 Storage Battery Tube $6.50 The More You Know About Radio The More You Rely on De Forest Without Lee De Forest's discovery of the vacuum tube there would be no radio today. All radio broadcasting, all radio receiving by means of tube sets, rests on De Forest patents. De Forest has been a pioneer in radio since 1900 and De Forest is a pioneer today. That is the reason for the great success of the De Forest Reflex Radiophone. That is the reason for the success of the new De Forest tubes — DV-2 Storage Battery Tube, DV-3 Dry Cell Tube. If you want a radio receiving set with a range on indoor loop of from 1,500 to 3,000 miles, depending on atmospheric conditions; if you want simplicity of control, clear reception without distortion and without extraneous noise; if you want operation on either wet or dry cells — see the De Forest Reflex Radiophones at the De Forest agents today. The D-7A Keflex Badlophone is a three-tube set at $125.00; the D-10 Keflex Radiophone has a drawer in its cabinet for dry batteries and is a fonr-tnbe set at $150.00. No matter what yon pay, yon can't get greater radio satisfaction. Whether yon buy your set complete, or build yonr own from the laboratorytested De Forest parts, you can rely on De Forest, the greatest name in Radio. DeForest Radio Tel. & Tel. Co. Dept. R. D. 7 Jersey City, N. J. De Forest Portable Reflex Radiopkone trpe D-10. which operates oo wet or dry cells, has a reception range of from 1.500 to 3.000 miles on indoor loop; has drawer for all necessary A and B dry cells. Price $150.00. plus approximately 6% for transportation In territories west of Rods? Mountains. Dc^Ergst Radio Catalogs Free Send a postcard for De Forest's Free Radio Catalog with full details and prices on sets, tubes, and parts. De Forest products are sold only Ihrouga exclusive agents direct to the public for your protection. The De Forest Company will be glad to hear from representative dealers in various communities who wish to become exclusive De Foiest agents. -^ 1 1 1 f 1 1 1 1 1 1 [ 1 1 i 1 1 f 1 ! i 1 1 f 1 1 1 1 1 M 1 1 1 1 1 1 1 1 1 1 1 B 1 1 1 £ S 1 1 1 ! 1 1 f 1 1 1 1 1 1 E 1 1 1 1 1 f I ! 1 1 1 1 SEND NO MONEY WE SHIP C. O. D. iimmiiiimiMmMimimimiiiiiiiimiiiiiiiiMiiiimmiiiiiiu 55 Vesey Street New York City Goods shipped C.O.D. Just pay the postman tVEfty iUVflW* s°tD ON WRITTEN AfiWf K'JJACK C[/AnMfl* ?????ISIT? Be sure your name is on our mailing list for weekly specials. No cost to you. SEND FOR IT AT ONCE. SUPERTRON TUBES Just received a new shipment. Oh, boy, what an amplifier! Better than ever. At this price they'll go fast. The 201 A's are 6 volt, dry cell or storage battery operated, and the W. D. 12 type uses V/i volt dry cell. Better get your order in now. Both types. Reg., $6.50. Special $3.43 VARIABLE CONDENSERS Just get these points! 1. Heavy moulded end plates. 2. Phosphor-bronze contacts to heavy binding posts. 3. Processed aluminum plates that retain their alignment. 4. And the list price is double what we ask. 11 plate $1.05 23 plate 1.35 43 plate 1.95 VERNIER CONDENSER with dial. Same as above. 11 plate vernier $2.65 23 plate vernier 3.00 43 plate vernier 3. SO VARIOMETER Let's tell you about the new variometer! First of all, it's moulded. Of course, it has pigtail connections for efficiency. And a positive stop. Split? Oh, yes. Can be split for any circuit. Green silk windings and takes 600 meters. Reg., $5.50. d» Q CQ Special «Pu>Ut/ THE DE LUXE SOCKETS A new process enables us to offer an unheard of value. By this new method a nickel tube is forced into a moulded base under heavy pressure. This assures per feet contact with the phosphor bronze springs, ijj Easily worth 75c each frOC PHONES For this sale we are going to let you have TURNEY 3,000 ohms phones for a very low figure. tf» O A ft DIALS Mahogany colored dials with exceptionally heavy brass bushing. Will dress up your set. Change your dials and make your friends think you have a new C/\^. set. List, $1.00 OUC Magnavox, New Type $32.50 :;osit with Order. Brandes Talker 8.98 Hilco Couplers 6.25 OTHER SPECIALS This Week Only Dictogrand Talkers. . $16.95 Erla Transformers.. 4.25 Brandes Phones 5.19 Baldwin Phones 8.95 A five tube assembly kit which includes everything necessary to build a genuine Hazeltine 5 tube set. Just picture this: A drilled and fully engraved Panel 3 4" Black Grebe Type Dials 3 Genuine Hazeltine Neutroformers, mounted for you on 3 Moulded End Quality Condensers 5 Bakelite Brunswick Sockets 1 60 Ohm Shackton Rheostat 1 30 Ohm Shackton Rheostat 2 Genuine Heghog or Fitzerald Transformers 20 Feet Bus Bar 7 Engraved Binding Posts 1 Filament Control Jack 1 Single Closed Jack 1 Freshman .006 Condenser 1 Freshman Grid Leak and Condenser 1 Base Board for Mounting All Parts Guaranteed Perfect $27.75 ADDITIONAL ACCESSORIES These accessories, added to the above list of parts are ABSOLUTELY ALL THE PARTS NECESSARY FOR A COMPLETE SET IN OPERATING CONDITION. 5 Tubes (Type 201A) $17.25 2 45 Volt "B" Batteries 6.00 1 60 Ampere "A" Battery 10.95 1 Pair Phones, 3,000 Ohms 3.75 1 Antenna Outfit i,so 1 7x24 Cabinet, Mahogany Finish 4.95 $44.40 GOLD BUS BAR Most Efficient, high frequency least resistance, finest sets. Reg Allows currents Used in 15c. 8c HYDROMETERS Very Accurate. Packed in wooden -noisture proof box. Reg. 75c. 39c TUBE PROTECTORS Impossible to blow your tubes if you ,-ttach these to end of socket for l4 or 1 amp. tubes. 29c TRANSFORMERS Audio Frequency, well known standard make. Ratio 4-1. Reg. $5-5». $2.89 VERNIER CONTROL For any Dial. Makes a Vernier rut of any make condenser. Very efficient. Reg. 75c. 29c JACKS Single or Double Heavy Springs — German Silver Contacts. Nickel finish. Reg. 90c 39c AERIAL WIRE 7 strand tinned copper wire gives excellent results on DX work. Reg. $1.00. 55c per 100 Feet LITZ WIRE Most efficient. A double silk covered wire with 37 strands of No. 38 wire, each strand enameled. Wonderful for Coils, Loops, etc 3c per Foot Beaut els m< Hard 7x10 7x12 . 7x14 7x18 7x21 7x24 7x26 PANELS iful high finish ide by the Ame Rubber Co. panrican .$0.85 . Lit 1.20 . 1.S0 . 1.7S . 2.00 . 2JS RADIO CORPORATION PHONOGRAPH UNITS Complete with cord and plug. they make a truly wonderful showing in both volume and clarity. List. S1S.0O. Specia., $8.50 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 l 1 1 1 1 1 1 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 1 1 1 1 1 1 f 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 l 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 iimiiiimmiiiiiiiiiiiiimiiiiiiiiii£