Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 32
n r … Vacuum tubes of English manufacture. A and B are soft detector tubes,C and D are hard amplifier tubes. ^ is a SOO-watt transmitting tubeand F is a SOO-watt rectifying tube. The special construction of E andF allows the filament to be replaced without destroying the whole tube. VACUUM TUBES 15 day…
Radio
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