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Vacuum tubes: Difference between revisions
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added outgassing
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===Loss of vacuum=== | ===Loss of vacuum=== | ||
aka tube "getting gassy" − can be caused by glass leak, electrode/glass interface leak, broken glass. | aka tube "getting gassy" − can be caused by glass leak, electrode/glass interface leak, outgassing of internal tube electrodes, or broken glass. | ||
Can often be detected by visual inspection in glass-envelope tubes, either when the envelope is visibly cracked, or if the getter (silver-colored metallic patch) has turned white or entirely disappeared. | Can often be detected by visual inspection in glass-envelope tubes, either when the envelope is visibly cracked, or if the getter (silver-colored metallic patch) has turned white or entirely disappeared. | ||