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Show Auto Batteries Are Not Suited for Radio Tubes Many people who use automobile starting batteries of (lie regular six-volt six-volt .type to light the tubes in their radio sets notice that n charge does not seem to last long, and that ihe batteries are continually running down. They are especially puzr'.led he-cause he-cause these butteries usually have a rated capacity of 100 ampere-hours, which should be sufficient to insure at least two weeks of service without charging. The trouble is due to the fact that automobile battel ies are not designed for radio use. They are constructed to simply a heavy rush of current for a snort time, just to turn the engine over a few times before the magneto si arts to work. Radio sets, however, require a small amount or current over a comparatively long period. When an automobile battery is employed em-ployed for lighting the filaments of radio tubes the plates are not sufli-enlly sufli-enlly worked, ami the active chemical materials imbedded in the plates take on a state of stagnation, explains Radio News. The charge and discharge dis-charge rate for an automobile battery is very high; dec-ease one or both anil battery suffers in consequence. The radio set owner is advised to purchase a storage battery having a capacity of 00 or 80 ampere-hours, these medium sizes being plenty hig enough for even the largest receivers". |