Radio Broadcast (May 1929-Apr 1930)

A JOBBER LOOKS AT HIS DEALERS {Continued from page 194) his dealers, employs a younger assistant. The assistant is an expert serviceman, and incidentally a sales representative. When the salesman makes his weekly visit to a dealer, he asks him for the names and addresses of the dealer's new customers, whose sets have been installed recently. The junior salesman calls on them, settles any misunderstandings or questions they may have about the operation of the set, checks over the installation, and sees to it that they are thoroughly satisfied with their purchase. The practical result of the system is best described in Mr. Craddick's own words. "Here's a concrete instance. A salesman and his junior called on a dealer in a New Jersey city and received the names of ten people who had just bought sets from the dealer. The junior made the ten calls, and brought back to the dealer the names of ten new prospects, given him by the customers. Out of those ten prospects, the dealer sold five within the next few days; the junior salesman made his calls on those five, and from them got the names of two new prospects, both of whom the dealer sold within a week of the junior salesman's first appearance at his store. "There were seven sets sold as a result of the original ten sales and the junior salesman service. Now take the dollars and cents of it. The salesman has to pay the junior's salary. Suppose that he paid him, in that instance, sixty dollars a week flat salary. Seven sets were sold, which we'll put at an average price to the dealer of $200. That's $1400; the salesman works on a 5% commission, which brings him $70, or an added income to him of $10 for that week due directly to the hiring of the junior salesman. And that, of course, was just from one of the several dealers on his weekly visit list. Furthermore, the dealer is delighted. He's made staunch friends of 17 cus tomers, who will give him, and the particular set, priceless word-of-mouth advertising in the community. And also, the junior salesman can make the more troublesome of the dealer's ordinary service calls. Many dealers now greet the junior salesman with a fist of service calls from their customers, all of which are made by the junior at the regular fee. "It's a novel scheme, I think. At first my salesmen didn't take to the idea of paying an assistant's salary. In every case, however, a trial has shown them that it means more business and so more money for them, and they're all strong for it now." In addition, Mr. Craddick concluded, the dealers have seen the value of expert service work, of the "call-back visit after installation, and have been helped in building up their community clientele. Which is just what the junior salesman scheme was designed to do. PROFESSIONALLY SPEAKING ( Continued from page 203 ) reduced, not increased, that the public should be encouraged to listen for high frequencies and to appreciate the improvement in fidelity brought about by the use of better audio systems. We believe that those who talk of increasing the number of stations by reducing the channel width should spend their energy on reducing "man-made static" and thereby permit the full use of high-" quality" amplifiers. We laud the set manufacturer who continues to put the best possible audio system into his set, even though the listener in general is not yet educated to look for real fidelity. Receivers of fidelity of a high order may seem to be more noisy on " DX" but even now, some makers are including filters which can be switched on to cut down high-frequency response when the set is asked to "reach out." CALCULATING DETECTOR OUTPUT (Continued from page 2-iO) is employed. The data of Table F shows the signal must be increased to 0.8 volt r.m.s. to obtain the same output as obtained with grid detection and a 0.20 volt r.m.s. signal. The ratio of signal input for the same output is then four to one. Columns 3 and 4 of Table I show a comparison of the computed and measured d.c. component of the rectification. The agreement is close up to very large signal amplitudes. An actual comparison of overall results obtained with grid leak and with plate detection shows less difference in sensitivity than is indicated here. The selectivity and the amplification in the stage feeding the detector are increased considerably by changing to plate detection. Plate detection is particularly advantageous when the signal input is large. Grid-leak detection is not used for inputs greater than a few tenths of a volt. Plate detection may be employed for any signal amplitude by the simple expedient of increasing both grid and plate voltage. It is possible to use inputs of several volts delivering sufficient output to operate the power tube without any intermediate audio stage. Some data showing the a.f. output of several tubes used as detectors are given in Fig. 6. They show the superiority of the c-327 as a grid-leak detector. To summarize the preceding, the object has been to illustrate the calculation of detector characteristics from the wellknown static characteristics of a tube. It is hoped that the curves and relations given have illustrated the problem adequately so that detector theory will be applied more often to numerical solutions in approximating the performance of that stage. Many factors influencing the quantity and quality of the detector output have not been mentioned here. The discussion of these factors will be reserved for a later article. SUMMARY OF RECEIVERS EXHIBITED AT THE CHICAGO TRADE SHOW (Continued from pa'je '209) Table Screen Company Model Price or Grid Tubes Used Console Tubes United 21 Peerless $ 195.00 Console Yes 3-224, 3-227, 2 Reproduc 245, 1-280 ers Corp. 22 Peerless $ 245.00 Console Yes 3-224, 3-227, 2 245, 1-280 23 Peerless $ 245.00 Console Yes 3-224, 3-227, 2 245, 1-280, 1 201A 24 Peerless $ 375.00 Console Yes 3-224, 3-227, 2 245, 1-280 25 Peerless S 600.00 Phono Yes 3-224, 3-227, 2 radio 245, 1-280, 1 201A 65 Courier $ 85.00 Table Yes 3—224 2-227 2— 245! 1-280' 651 Courier $ 140.00 Console Yes 3-224, 2-227, 2 245^ 1-280 652 Courier $ 165.00 Console Yes 3-224, 2-227, 2 245, 1-280 653 Courier S 165.00 Console Yes 3-224, 2-227, 2 245, 1-280, 1 199 U. S. Radio & 36 $ 39.95 Table No 1-226, 1-227, 1 Television 171, 1-280 Co. 50 $ 69.95 Console No 1-226, 1-227. 1 171, 1-280 55 $ 74.95 Console No 1-226, 1-227, 1 171, 1-280 60 $ 79.95 Console No 4-226, 1-227, 1 171, 1-280 70 $ 119.95 Console No 2-171, 5-226, 1 227, 1-280 89 $ 69.95 Table No 2-171. 5-226, 1 227', 1-280 54 $ 67.95 Console No 5-201A, 1-171A 22 $ 37.95 Tabic No 5-201 A, 1-171 A Table Screen Company Model Price or Grid Tubes Used Console Tubes Zenith Radio 41 $ 100.00 Table No 1-171, 5-227, 1 Corp. 280 42 $ 175.00 Console Yes 1-224, 4-227. 1 210, 2-281 39 A $ 510.00 Console No 6-227, 1-226, 1 210, 2-281 40 A $ 850.00 Phono No 6-227, 1-226, 1 radio 210, 2-281 English $ 800.00 Console No 2-227, 6-226, 2 210, 2-281 Spanish S2500.00 Console . No 2-227, 6-226. 2 210, 2-281 Special Console No 37 A S 625.00 Phono No 5-227, 1-226. 1 radio 250, 2-281 NOTES Dynamic type loud speakers are used in all the console models with the exception of certain models made by the Acme Electric and Mfg. Company. Ruckingham Radio Corporation, Federal Radio Co., Freed Eiseman Radio Corp., Chas. Freshman Co., and the United Reproducers Corp. D.C. light socket operated and battery operated models are being made by Atwater Kent Mfg. Co., Day-Fan Electric Co., Freed Eiseman Radio Corp., Kolster Radio Corp., Sparks-Withiugton Co.. Stewart Warner Corp.. RadioVictor Corp. of America, and the Crosley Radio Corp. Radi Zenit _ _ Co., Sparks Withington Co., The Pierson Co.. Kellogg Switchboard Supply Co., Grigsby-Grunow Co., A. H. Grebe & Co.. Electrical Research Labs.. Thos. A. Edison, Inc., Continental Radio Corp.. Columbia Phonograph Co.. Rush & Lane Piano Co., F. A. D. Andrea. Inc., Amrad Corp., and The A. C. Dayton Co. Radio-phonograph combinations are made by RadioVictor Corp. of America, uith Radio Corp., United Reproducers Corp., Temple Corp., Steinite Radio >., Sparks Withington Co., The Pierson Co.. Kellogg Switchboard Supply 242 • AUGUST 1929 • r