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Glowing plate
When a vacuum tube circuit malfunctions and draws excessive current, the anode ("plate") may overheat, sometimes causing a visible red or orange glow. In consumer electronics, this is universally indicative that the tube is experiencing an overload condition, though the reasons for the overload may vary.
Some high-powered vacuum tubes (e.g. large transmitter or induction heating tubes) have silica envelopes and/or graphite or zirconium coated tantalum plates which are intended to operate at glowing temperatures and thus employ ''radiation cooling''. The zirconium plate coating acts as a getter, and proper getter action in these tubes depends on the plate running at high temperatures. Such tubes may develop excessive gas content if underloaded for long periods of time. One trade name for this type of plate coating is Eimac's "pyrovac".
==Causes==
In consumer equipment, it is usually a sign of a shorted or badly mistuned load, or a badly out-of-bias condition. When testing, repairing or restoring vacuum tube-based equipment, it is wise to watch the plates of all the tubes for this condition.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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