by Rule17_
A single reliability issue of tubes with oxide cathodes is the possibility that the cathode could gradually grow to be "poisoned" by gasoline molecules from other components in the tube, which decrease its ability to emit electrons. Trapped gases or gradual fuel leaks can also damage the cathode or lead to plate (anode) latest runaway due to ionization of cost-free gas molecules. Vacuum hardness and correct choice of building supplies are the significant influences on tube life
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