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Elements of radio telephony (1922)

Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 98

An illustration from Elements of radio telephony, 1922, leaf 98
g. 35 shows therelation between these quantities for a hard tube or one RECEIVING EQUIPMENT 73 in which the vacuum is very good and practically no gaspresent. Fig. 36 shows the same relation for a soft tubein which the vacuum is not quite so high and a small amountof gas remains. The sudden rise in… … Fig. 37.—One type of soft or gas content deteetor tube. the plate current whenever the grid voltage (or plate voltage)is brought above a critical value. This phenomenon iscalled ionization by collision and may be explained inthe following manner. In a tube from which all gas hasbeen exhausted and…

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