Abstract
THORIATED-TUNGSTEN WIRE, developed nearly 40 years ago by the lamp industry, has found extensive application as an electron emitter in vacuum tubes over the last 30 years, first in receiving and small-power types and more recently in high-power industrial types such as the RCA-5770, RCA-5771, and RCA-5831. High-power types are considered as those having unmodulated class C plate voltage ratings of greater than 5,000 volts.
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