What is
Cathode, Electron-Tube,
Directly Heated (
)
A directly heated cathode for an electron
tube comprising a base plate made of an alloy containing 20 to
30% by weight of W, 0.12 to 0.28% by weight of Zr and the
remainder being Ni and an electron emissive oxide layer disposed
directly on the base plate shows good and stable electron
emission properties and when it is installed in a television
picture tube, the picture tube shows excellent initial
properties.
