Radio Digest (Oct 1923-July 1924)

RADIO DIGEST — Illustrated October 20, 19k DRY CELL TUBE CIRCUIT IN SIMPLEX FORM — cCTHBE — — ■ SINGLE WIRE AERIAL 4 GROUND THE diagram given tills time is especially suited for the use of dry cell tubes. In addition, the connections for a lightning arrester are indicated. Most of the newer fans in Radio are somewhat at a loss as to the proper connections for this safety device. The same method of application holds true for all circuits. The circuit is regenerative because of the capacity feedback between the plate and antenna. The secondary circuit is especially selective for long distance work because of the variometer and variable condenser, in addition to the variocoupler rotor control. The use" of a high resistance potentiometer not only helps to get the best out of the tube but is also beneficial for long distance tuning. No variable grid leak is necessary. The plate voltage can be 22f% volts as indicated or more as required for be*t operation of the tube. The use of the open circuit jacks enables easy plugging in of the phones. This Is Worth Knowing The 43-plate condenser is considered good for short wave work; it is essential for the long wave; hence to eliminate another change over switch it is retained in the circuit when tuning for the broadcasting stations. Causes and Remedies of Noises in Receiving Sets Noise in a Radio set can be attributed to many causes. One of the most persistent trouble makers is the B battery. After several months of use the cells start to deteriorate, and this makes itself known in annoying scratches in the ear phones. The only remedy is to replace the batteries. Poorly constructed variable grid leaks are particularly troublesome, because the moving arm cannot be properly tightened when the device is manufactured and the connection to the resistance line is not so good as it might be. The tips of the vacuum tube base must be cleaned often; a surprising difference in results will often be noticed after this is done. The same applies to the contact springs in the tube socket. Saturn 'Above the Ordinary* Radio Products $1 Automatic Plug Terminal tips inserted, or removed in PRICE a moment. Perfect electrical connec ( tion without taking apart or soldering. Tour satisfaction with the Saturn Automatic Plug unreservedly guaranteed. Perfect Jack A difficult soldering job made easy by crowfoot offset and solder-flex compound on blades. Brass brackets, nickel-plated, with rounded corners. Blades of spring German Silver. Solid stiver contact points. Bight in every detail. Your order tilled by mail promptly Every order absolutely guaranteed Prices No. 1— Single Circuit, Open 50o No. 2 — Single Circuit, Closed 55c No. 3 — Double Circuit, Closed 75c No. 4 — Single Filament Control 7r>c No. 5— Double Filament Control 80c The SATURN Mfg. & Sales Co. 48 Beekman Street New York, N. Y. COMPLETE STANDARD PARTS SSS MYSTERY MILOPLEX RHEOSTATS Our Price MARVEL Rheostat, 6 ohms $ .35 MARVEL Rheostat, 20 ohms 45 MARVEL Rheostat, 25 ohms .45 MARVEL Rheostat, 30 ohms 45 MARVEL Rheostat, 40 ohms 55 MARVEL Rheostat, 50 ohms 65 Potentiometer, 200 ohms 55 Potentiometer, 400 ohms 65 Potentiometer. 1,850 ohms 2.20 VARIABLE CONDENSERS Our List Prico Variable Condenser, .0005 (Same as 23 plate) $5.50 3.00 Variable Condenser with Vernier, .0005 (Same as 23 plate) 6.50 4.50 Variable Condenser, .001 (Same as 45 plate) 6.00 3.50 Variable Condenser, with Vernier, .001 7.50 5.00 Walnart Variable Condenser, .00025 1.75 VARIOMETERS List Our Price $4.39 5.50 Moulded Variometer $6.00 Variometer, All Circuits VARIOCOUPLERS Webster Variocoupler with dial, Type 1A Our List Price $4.50 $2.1" Moulded Coupler 5.50 4.1" Moulded Bakelite Variocoupler 6.00 AU-Meter Variocoupler, 150-2600 meters ... 7.00 GRID-LEAKS Freshman Grid-Leak with Condenser. $1.00 $ .79 Freshman Grid-Leak 75 .59 MISCELLANEOUS Our Llst Price Switch Lever. 1-A, 1%" Radius, 1%" Knob, ft" Shaft $ .75 $ .35 Presto Aerial Supersedcr, Adjustable: can be attached to electric light socket or telephone 3.00 2.00 Rogers Receiving Radiometer; can bo used like Radio Frequency Trans formers 3.00 Combination Socket and Rheostat with Vernier 3.00 2.29 B-Metal Ever-Ready Tube Detector, Type B 1.50 Erla Reflex Crystal 89 Hydrometer Perfect 85 .65 1 .0005 Variable Condenser 1 Estru Variometer 1 .00025 Variable Condenser 1 Variable Grid Leak and Cond. 1 .002 Phone Cond. 3 3-2 inch Dials 1 Potentiometer 1 Rheostat, 6 ohms 1 Socket, Bakelite base 1 Bakelite Panel, 9xl4V« 1 DeForest D.V.-6 Tube 1 B Battery, 12h volt 3 Dry Cells 12 ft. sq., brass.bus wire 1 Set Readers Bind. Posts ONLY .... $2850 WEBSTER V Vradxo apparatus SPECIAL ON UNITS (Enclosed in substantial beautiful mahogany cabinets) Our List Price Webster I -A Tuner Unit $35.00 $17.50 Webster 2-A Detector Unit 15.00 7.50 Webster 3-B Audio Frequency Amplifier Unit. 27.50 17.00 Webster 3-A Audio Frequency Amplifier Unit. 17.50 8.50 Webster 4-A Radio Frequency Amplifying Unit 17.00 7.50 Single Tube Webster Receiving Set (Non-Regenerative Type), without head set and tube, in beautiful mahogany cabinet: list price, $30. Our price, while they COrt fifij last. Only "f'u'w The above Webster Receiving Set complete with Baldwin Phones. B Battery, Dry Cells and Tube; list price, $41.30. Our special price as long as we fl*? KC\ have them ipo^.OU TRANSFORMERS Webster Radio Frequency. 5 A-l. wave length 200 to 500; 5 A-2, wave length 300 to 1200; 5 A-3, wave (fj 1 Q length 500 to 2,000; $4.00 «»«».* J7 All American, Ratio 1-5 All American, Ratio 1-10 $4.00 $4.00 PHONE RECEIVERS our List Price Webster Double Head Phone Receivers, 2500 ohms $7.00 $3.49 Double Phone Cord 1.00 .75 Baldwin Type C Unit 6.00 3.49 Baldwin Type C Double 12.00 6.95 LOUD SPEAKER Audiophone Loud Speaker (Large Size) $22.50 Loud Speaker Cord, 20 feet, 4 tips, our price 1.00 WIRE All kinds of wire put up In % pound spools. No. IS to No. 28, silk, cotton and enamel, double or single 45 cents a spool Same wire as above on hi pound spools. .75 cents a spool Hook-up Wire, No. 11 square brass, cut in 10 foot lengths 15c Madera Clear Speaker AT LAST— REAL SPEECH— REAL MUSIC— FROM DIE-CAST WOOD HORN Finished Crystallized Black and Mahogany Complete with unit $1522 Height 12 inches Diameter BeU 10 inches ABSOLUTELY GUARANTEED Natural tone from Radio made ivssible by I new process discovered ! We break down wood to original fibre, forcing it Into steel dies under twelve tons You and 1 would not think of making a violin of metal or cardboard, expecting to reeeive wonderful tones. Why use it for radio horns? Talking machine people gave up metal horns years ago. The best violins are made of wood, whose fibres are very close together. The tighter the fibres the better the tone quality. We compress fibres closer Hum they ai* in any wood. Everything in Radio Write Us We Are Responsible Folks. Money Promptly and Cheerfully Refunded If You Are Not Satisfied All Orders Mailed Promptly. Parcel Post Prepaid on $5.00 or Over Quality Merchandise at Low Prices Economical Radio House 4600 Lincoln Avenue, Chicago We Personally Guarantee All Goods ALL THE PARTS R. D.-99 LONG DISTANCE RECEIVER (See September 29th issue Radio Digect) 3 Sockets: 3 Rheostats: 2 A. F. Transformers; 2 Double Circuit Jacks; I Open Circuit Jack: I Radiometer; I Variable Grid Leak and Condenser: I .0005 Variable Condenser: I .005 Fixed Condenser; I 75 Turn Honeycomb Coil. Mounted: I Single Coil Mounting; I Set Readem Binding Pacts: I Bakelite Panel, 7xl6XiV OUR PRICE $ 3025 TUBES De Forest Tube. D V 6 $6.50 6.50 6-50 6.50 6.50 5. 00 7.00 $5.00 W D-12 or C-12 5.4S 5.45 C-299 5 75 5.75 U. V. 200 Radiotron 4.35 Clean one. Detector or Amplifier. 4.0* Readem Binding Posts. S*t composed of 1 antenna. 1 ground. 1 A U>ry + , 1 A Batterv— . 2 tele 1 B Baltery-i-. 1 B Ba H. C. COIL MOUNTING Lis; Three Coll Mounting with Dial $5.00 $3.85 Glared Three Coll Mounting 5-00 FREE Choice of following items on purchases of Five Dollars or over: Freshman Grid Leak and Condenser Webster 1-A Dial Knob, 3H inches, 3/16 shaft WEBSTER SWITCH LEVER TWO CIRCUIT JACK OPEN CIRCUIT JACK