Dangers
If the tube is overloaded, not only can the plate warp, causing a short to outer grids or beam-shaping elements, but the emissive layer on the cathode will be consumed very quickly. The equipment's power supply and the tube's load (output transformers, flyback transformers, etc.) are likely to be damaged by a sustained overload condition, so power should be immediately disconnected when a glowing plate is found.
Read more about this topic: Glowing Plate
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