Radio mirror (Jan-Oct 1923)

April !.}. ) ! < ; ; The "How" of the Simplified Super Circuit Part X — An Explanation of Several Causes of Failure By E. 7 . Flewelling DURING my travels throughout the United States I have been able to l>iek UP sonic very valuable information concerning the points that seemed to give the fans the greatest amount of dilliculty in securing successful operation of the Flewelling circuit. It seems best at this time to get right down to cold, hard, point-blank statements as to how the circuit should be handled, because it Is only in this way that one may be sure of securing; the results that most of us know may be obtained. The various parts have been discussed but there are so many new fans who have entered into the game that it is only fair to go over some of the points for their benefit. Utilizing a Nuisance Previous articles have shown that one of the main features of the circuit is that of changing a nuisance into a utility. To be more clear, in the old days, the squealing and howling caused by rectification with a block tube, due to oscillations and improper grid leak settings, etc., was considered the nuisance. Now, in the Flewelling circuit the entire secret is this: Absolute control of the blocking and absolute control of any squealing or howling that may present itself in the operation of the circuit. This is done in two ways; with proper values in the circuit itself, and by positive control of the grid by the way of the grid leak. The whole secret of the circuit operation actually centers on this point. Everything else being right, If you are unsuccessful in making the circuit operate, then you may concentrate your entire efforts on the grid leak. Proper Grid Leak Necessary At the time the circuit was first brought out, it was an impossibility to secure any satisfactory form of commercial grid leak due to the popularity of the Flewelling circuit and our constant hammering on the point that a good grid leak is an absolute essential in any Radio circuit, especially one using hard tubes, however, there are now several more or less acceptable forms manufactured. There is one type in particular that enjoys a large scale that is not at all suitable for any Radio circuit. It is suggested that you be careful not to try this form on the Flewelling circuit. It seems too bad that we must limit our remarks to suggestions at times, but due to the large field that we are in and the fact that the writer has no personal axe to grind we will have to satisfy ourselves with references only to those types that have been used and found successful. Grid leaks are very difficult to manufacture and secure uniform results from each and every one and it is suggested that you purchase what you believe to be a reliable form and if you are unable to secure results from it understand that possibly you were unfortunate in that the particular one that you purchased happened to be defective. Give the leak benefit of the doubt and purchase another one. This may seem a peculiar procedure but it is suggested in view of the writer's extensive experience with the types of leaks now manufactured. I am simply passing this on to you as my own personal experience, and it is only a profitable thing to do. As said before, a good grid leak is valuable on any set. Mounting the Coils Another point that comes to mind is the matter of mounting the coils. I am going to have a lot to say about various coils in future articles. The plan is to broaden out considerably from the 50 and 75-turn coils. Considering these two just now, the point comes up as to whether tight or loose coupling is desirable. It is easily answered to this end. Local work frequently calls for loose coupling. Distance work on the other hand almost invariably calls for close coupling. Many are troubled with the question "What type of mounting should be used?" and this is answered in the same way as before. A good reliable honest product is the only answer. Inasmuch as I have suggested various types for other parts of the circuit, I will say that at this time I am using the Crown coil mounting, which, I believe, is manufactured in New York. The idea to be looked for in a coil mounting is the ability of the mounting to give either loose or close coupling and stay where it is put. In other words, do not purchase a mounting that is unable to hold its setting. Adjusting the Colls This brings us to the point which I have often emphasized, but the Radiophans seem to overlook. The Flewelling circuit has been reduced to the point where it is •as simple as can be expected and where it is guaranteed to work immediately if the famous grid leak and other parts are right, with this one exception, the fields of the two coils must work together. Therefore, when the circuit is entirely finished and it does not operate, and the grid leak has no effect on it, there is only one thing to look for, and that is the ability of the coils to "work" together or "buck" one another. They must work together. Try reversing the two lead going to the 75-turn coil, if unable to get results. These two points are the kernel of the nut. If they are right, it is safe to say that you will enjoy the same wonderful results as reported to date by thousands of my friends. Combination WD1 1 Tube Socket and Grid Leak An inexpensive and neat little socket for the YVD 11 tube was made up in combination with the grid leak condenser and support as shown in the accompanying sketch. A piece of H-inch thick insulating composition was cut 2 % by 3 PENCIL HARK VAR, CRlO l£AB CONDENSER inches to serve as a base. Four vacuum sockets were located, as shown, to take the tube prongs. A variable grid leak of the pencil type with cap was mounted near one edge. The grid condenser is of the type to fit the terminals of the leak and is attached thereto underneath the base. Two pieces of ^-inch STATEMENT OF THE OWNERSHIP. MANAGEMENT. CIRCULATION. ETC., REQUIRED BY THE ACT OF CONGRESS OF AUGUST 24, 1912. Of RADIO DIGEST, published weekly at Chicago, Illinois, for April, 1923. of Illinois, County of Cook, SS. — Before me. a notary public in and for the State and county aforesaid, personally appeared E. C. Hayner, who. having been duly sworn according to law, deposes and says that he is the publisher of the RADIO DIGEST and that the g Is. to the best of his knowledge and belief, a true statement of the ownership, management (and if a daily paper, the circulation), etc., of the aforesaid publica'ion for the date shown in the above caption, required by the Act of August 24. 1912, embodied in section 443, Postal Laws and Regulations, printed on the reverse of this form, to wit: 1. That the names and addresses of the publisher, editor, managing editor, and business managers are: E. C. Rayner. 717 Irving Park Blvd.. Chicago. Til. : editor. Chas. F. Smisor. 4757 Lake Park Ave.. Chicago, 111.; managing editor, Evans E. Plummer. 101S X. State St., Chicago, DJ; business manager, none. 2. That the owners are: (Give names and addresses of individual owners, or. if a corporation, give its name and the names and addresses of stockholders owning or holding 1 per c?nt or more of the total amount of stock.) Radio Digest Publishing Co.. Inc.. 123 W. Madison St.. Chicago, Ills.; E. C. Rayner. 717 Irving Park Blvd.. Chicago, Ills. : S. 0. Bronsteln. 4600 Lincoln Ave.. Chicago. Ills. ; F. T. Ryan. 123 W. Madison St.. Chicago. Ills.; A. B, White. 7015 Ellwood Ave., Chicago. III.; Joseph Seaman. 2CO Fifth Ave. New York. X. Y. : George Seaman. 2350 Parkwav. W. Chicago. DX; D. B. Seaman, 49 Cedar SL, Chicago, Dl. 3. That the known bondholders, mortgagees, and other security holders owning or holding 1 per cent or more of total amount of bonds, mortgages, or other securities are: (If there are none, so state.) None. 4. That the two paragraphs next above, giving the names of the owners, stockholders, and security holders, if any, contain not only the list of stockholders and security holders as they appear upon the books of the company but also, in cases where the stockholder or security bolder appears upon the books of the company as trustee or in any other fiduciary relation, the name of the person or corporation for whom such trustee is acting, is given; also that the said two paragraphs contain statements embracing affiant's full knowledge and belief as to the circumstances and conditions under which stockholders and security holders who do not appear upon the books of the company as trustees, hold stock and securities in a capacity other than tbat of 4 bona fide owner; and this affiant has no reason to believe that any other person, association, or corporation has any interest direct or indirect in the said stock, bonds, or other securities than as so stated by him. 9. That the average number of copies of each Issue of this publication sold or distributed, through the mails or otherwise, to paid subscribers during the six months preceding the date shown above is fTliis information is required from daily publications onhv.) E C. RAVXER. Publisher. Sworn and and subscribed before me this 2(uh day .^f March. 1 I SEAL) TEAX M. MEACHER. (My ccmiEi^icn expires Septen-ber 8th, 1926.) brass, % inch wide were cut and bent to form angle supports as shown. Use 6-32 or 8-32 round head brass screws and nuts for fastening the supports to the base. The whole arrangement is attached to the panel just under or over the rheostat, as desired, by means of the same size flat head brass screws and nuts. — J. M. Walsh, Honesdale, Pa. Cut Down Aerials LONDON, ENGLAND. — French Radio experts are having considerable difficulty ascertaining who is broadcasting on the same wave length as the Eiffel Tower and at the same time. In the vicinity of London there is a problem of a different nature. Interference from amateurs has been prevalent and now someone has taken to RADIO At Cat Prices Standard parts only in original packing. Sold on a "money-back" basis. PHONES Modell's Special, 2200 ohm $3.45 $ 8.00 Brandes Superior 5.95 12.00 Xathaniel Baldwin Type C. Double. . . 8.95 6.00 Xathaniel Baldwin Type C, Single 4.50 TUBES H4Volt Mercury Tubes $4.95 U. V. 201 5.50 Imported Peanut Tube 2.00 (Can be used on 2 dry cells.) Socket extra.. .40 CABINETS Made in our factory 7" x 10" $1-85 7" x 18" 2.45 7" 2 24" 2.95 SETS $132.00 Badiola R. C. Set $79.50 Little Gem Crystal Set 6.50 25.00 Aerex Crystal Set 9.95 25.00 Aeriola Jr. Crystal Set 7.95 MISCELLANEOUS $5.50 Coto Coil Transformer $3.95 8.00 Dayton Variometer 5.45 8.00 Dayton Variocoupler 5.45 DURaTEK Permanent Crystal Detector 2.00 WD. -11 Adapter 65 $1.50 Lightning Arrester, Indoor and Outdoor Type 85 8.00 Atwater-Kent Variometer 6.90 8.00 Atwater-Kent Variocoupler 6.90 6.00 Atwater-Kent Detector Unit 4.50 1.50 Rell or V. T. or W. D. 11 Bakelite Socket 89 5.00 180° Coupler, Silk Wire Wound on Bakelite 2.95 7.50 Sleeper Variometer (Grebe Type) 6.50 4-inch Electros Dials 75 3-inch Bakelite Dials 35 W.D.-12 Transformer for W.D.-ll Tube 4.65 $1.00 Freshman Variable Grid Leak and Condenser Combined 75 $ 8.00 Genuine All-Wave Coupler 6.95 10.00—3000 Meter Coupler 4.95 18.50 Homecharger DeLuxe 13.95 1.00 Bakelite Socket 50 When Ordering by Mail Add Postage by the Following Scale PURCHASES Cp to $1.00 add 10c 51.01 to $2.00 " loo 2.01 to 3.00 " 20c 3.01 to 5.00 " 25c 5.01 to 7.00 " 30c 7.01 to 10.00 " 40c Money Order or Personal Check Accepted RADIO STORES Dept. F. 6, 191 Fulton Street, N.Y.C. cutting aerials down, in an effort to get rid of the alleged nuisance. The work is believed to be that of boys, but so far the miscreants have not been discovered. Fisher 180° Bakelite Gen. Variocoupler $2_25 3 Plate Vernier Condenser 40 15' Plate Precision Condenser 85 23 Plate Precision Condenser 1.10 43 Plate Precision Condenser 1.5S .006 Fixed Condensers js Freshman Var. Grid Leak & Cond .75 Freshman Var. Grid Leak only 69 Spec. Mtd. Audio Transformer 2.95 Switch Levers, 20c. Condensers 15 Reinartz Blue Prints, complete JO .00025 Grid Cond. & Var. Leak .38 Hard Rubber Panels, 7x10 85 Hydegrade Rheostat, Reg. 65c, Spec. .35 Potentiometer, 240 ohms 95 WRITE FOR COMPLETE LIST OF PARTS ECONOMY RADIO CO. 132 Nassau St., New York, N.Y. Dept. "RD" One of the uses of Radio is the taking of speeches, news and lectures by shorthand students, thus increasing their efficiency and speed. PREMIER 'MICROMETER" VARIOCOUPLERS Satisfy The Most Critical $5.00 COMPLETE WITH DIAL A HIGHLY SELECTIVE YABIOCOUPLER having Ics'J-degree orientaUon and 20 Antenna taps which facilitate very sharp tuning. Wound with No 21 single silk or black enameled pure copper wire Eighty turns on stator— fifty-five on rotar. All metal parts ranges from 150 to 750 meters. All metal parts brass — contacts positive — stays "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— Some territory open for live, responsible concerns. PREMIER ELECTRIC COMPANY Manufacturers Est. 1905. 3SC2-3810 Ravenswood Ave., CHICAGO, ILL,