Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art (1922)
Lescarboura, Austin C. (Austin Celestin), 1891- · New York, Scientific American publishing company [etc.] · leaf 143
of using a number ofdifferent voltages. The variable type is especially usefulin using certain types of vacuum tube with which the Bvoltage must be carefully adjusted. When it comes toamplifier tubes, the B voltage may be anything from45 volts up. There are also available special low-capacity high… … Inexpensive receiving: set making use of a variometer tunerand a crystal detector. Such a set is good for a range of25 miles, perhaps a little more, when receiving radio-phone. programs! operating cost must of necessity be lower than when usingdry batteries, which, when discharged, are worthless…
Radio
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