Assertion: tube's cathode | /r/CapableOf | produce more electrons
Facets:
value: far
type: DEGREE
value: at a given temperature
type: TEMPORAL
Source sentences:
text: The untreated thoriated tungsten filaments used in early vacuum tubes (called "bright emitters") had to be heated to 2500 °F (1400 °C), white-hot, to produce sufficient thermionic emission for use, while modern coated cathodes produce far more electrons at a given temperature, so they only have to be heated to 800–1100 °F (425–600 °C).