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 tubes) have graphite or zirconium coated tantalum plates which are intended to operate at glowing temperatures. 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".
Read more about Glowing Plate: Causes, Dangers, Common Occurrences
Famous quotes containing the words glowing and/or plate:
“You say, “It is dark.” And in truth, I did place a cloud before your sun. But do you not see how the edges of the cloud are already glowing and turning light.”
—Friedrich Nietzsche (1844–1900)
“Then he rang the bell and ordered a ham sandwich. When the maid placed the plate on the table, he deliberately looked away but as soon as the door had shut, he grabbed the sandwich with both hands, immediately soiled his fingers and chin with the hanging margin of fat and, grunting greedily, began to much.”
—Vladimir Nabokov (1899–1977)