Radio Broadcast (Nov 1924-Apr 1925)

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Selecting a B-Battery Eliminator What to Consider in Buying a B-Battery Subsitute — A Helpful Discussion of Moot Points of Economy, Operation, and Value By PHIL FAY SO MANY different kinds of current tap devices, widely varying in price and operating characteristics, have been offered the public, that a prospective purchaser, uninitiated in the technical phases of radio and electrical engineering, finds it difficult to make a choice. The usual recourse — that of consulting a friend who has one — is rarely available in the case of the current tap devices because few or none of the manufacturers have yet reached a volume of production which is very great. To secure satisfaction, it is absolutely necessary to select a B-battery eliminator which is adapted to your particular set and power circuit. A current tap device suited for use with a three -tube set frequently gives about as good service with a five-tube receiver as a bicycle tire with a Ford car. A further complication is added to the situation by. reason of the fact that radio salesmen are not yet sufficiently experienced with these devices -to make sound recommendations. If the binding post on a current tap device reads 100 volts, they unhesitatingly state that its output is 100 volts, while as a matter of fact, with some current tap devices it may vary between 40 and 275 volts, according to the set with which it is used. Hence the prospective purchaser will do well to make a little study of the subject before making an invest Batteries and Battery Eliminators The storage battery has been in use for a long time in lighting the filaments of radio receiver tubes. This secondary source of energy in fact has been used for that purpose ever since the vacuum tube was invented. More recently, however, the storage battery has been used as a source of plate potential with considerable success. The storage batteries which were used with tubes were for a long time simply those designed and used for lighting and automobile ignition purposes, but such batteries have their shortcomings. New storage cells have been designed especially ^for radio circuits and are to be had on the open market. The public has heard much and so far seen little of the devices designed and sold to replace batteries. Most prospective users are timid about purchasing these devices because they are not sure that they will perform as well as batteries. Mr. . Fay's article is of genuine, interest and contains facts which have" been found after actual test of the various methods of voltage supply for tubes. — The Editor. ment as large as one for the average receiving set, lest he find his purchase a liability rather than an asset. In general, there are four qualities to consider, which determine the value of a current tap device to its user. They are: i. The degree of silence with which it operates i. The life of rectifier tubes and their upkeep cost 5. Its adaptability to different types of receiving sets, and \. Its safety with respect to shock and fire. SILENCE IS GOLDEN AND DESIRABLE HT HE first quality * of a current tap device which you must verify is the silence with which it operates. At first sight, this may appear to be a simple matter — a few moments of listening at a radio store. A purchaser may conclude that a certain device is silent because it was demonstrated to his satisfaction, but upon connecting it up at his home, he may find it extremely noisy. Often the dealer or manufacturer is then accused in the mind of the purchaser of having a demonstrator superior to the product sold to purchasers. But this is quite unfair to dealer and manufacturer. A current tap device which may work perfectly in one electric circuit may be entirely unsatisfactory in another because of difference in its electrical qualities. The general impression that all 1 10 volt 60 cycle alternating current is