Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 41
lement tube was of the same construction as theFleming valve except that it contained a third electrodeoperating cold and located between the filament and plate. 20 ELEMENTS OF RADIO TELEPHONY The third electrode enormously enhances the value of thevacuum valve and increases its functions from that… … Fig. 7.—Three-electrode vacuum tubes. Receiving tube on the leftand 5-watt transmitting tube on the right. The location of theplate, grid and filament is indicated by the letters P, G and F. electric field around the filament is concerned. The spacecharge limitation of current is no longer…
Radio
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