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In modern-day repair and maintenance of early tube-based consumer electronics devices, a glowing plate will be rarely encountered. As a visible symptom of a destructive failure, checking for an overheated tube is essential to ensure the safe and reliable operation of the equipment undergoing
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Early color television receivers also used a complex dynamic convergence system, which was driven by both the horizontal and vertical output stages. Failure of part of this system could overload either tube, though this author has never seen such a failure in
184:, 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
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or other substantial short circuits within the device. The power supply's output may be easily disconnected from the rest of the circuit in order to determine whether the overload is occurring in the supply or
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Horizontal output tubes may also be overloaded by a flyback transformer with shorted turns, a defective damper (i.e. 6W4), high voltage rectifier (i.e. 1B3) or high voltage regulator (i.e. 6BK4) tube.
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Audio output tubes in radios, stereos, public address systems and guitar amplifiers (50C5, 6L6, etc.), usually due to a bad coupling capacitor upsetting the bias or a shorted load.
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Horizontal and vertical output tubes in television sets (6CD6, 21LU8, etc.), usually due to a shorted coupling capacitor upsetting the bias or the driving
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If the tube is overloaded, not only can the plate warp, causing a short to outer grids or beam-shaping elements, but the
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If any tube presents a glowing plate, the equipment should be shut down immediately to avoid further damage.
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Most frequently, a glowing plate overload will be found in rectifiers and output tubes. In particular:
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will be consumed very quickly. The equipment's power supply and the tube's load (
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circuit indicates that the tube is drawing excessive current. This causes the
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plates which are intended to operate at glowing temperatures and thus employ
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Some high-powered vacuum tubes (e.g. large transmitter or
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condition, though the reasons for the overload may vary.
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196:In consumer equipment, it is usually a sign of a
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53:. Unsourced material may be challenged and
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117:Learn how and when to remove this message
259:operating well out of its design range.
180:. The zirconium plate coating acts as a
16:Vacuum tube grid plate glow explanation
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51:adding citations to reliable sources
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432:(Hexode, Heptode, Octode)
451:Backward-wave oscillator
325:Theoretical principles
263:are sometimes faulty.
481:Inductive output tube
623:List of tube sockets
618:List of vacuum tubes
456:Beam deflection tube
226:flyback transformers
147:consumer electronics
47:improve this article
541:Traveling-wave tube
332:Thermionic emission
222:output transformers
145:or orange glow. In
644:Electronics portal
232:Common occurrences
200:or badly mistuned
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570:Numbering systems
551:Video camera tube
536:Talaria projector
318:Thermionic valves
178:radiation cooling
164:envelopes and/or
158:induction heating
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107:December 2009
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68: –
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62:Find sources:
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32:This article
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21:
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660:Vacuum tubes
526:Storage tube
420:Beam tetrode
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352:Control grid
347:Space charge
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160:tubes) have
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45:Please help
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531:Sutton tube
342:Hot cathode
135:vacuum tube
665:Electrodes
654:Categories
546:Trochotron
476:Iconoscope
466:Compactron
461:Charactron
405:Acorn tube
283:References
257:oscillator
252:elsewhere.
249:capacitors
77:newspapers
511:Phototube
506:Monoscope
501:Magnetron
496:Magic eye
486:Kinescope
430:Pentagrid
245:Rectifier
170:zirconium
34:does not
611:Examples
491:Klystron
471:Eidophor
446:Additron
410:Nuvistor
174:tantalum
166:graphite
151:overload
602:Russian
425:Pentode
415:Tetrode
270:person.
218:cathode
216:on the
208:Dangers
198:shorted
172:coated
91:scholar
55:removed
40:sources
436:Nonode
400:Triode
395:Audion
372:Getter
192:Causes
182:getter
162:silica
93:
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582:RETMA
390:Diode
382:Types
362:Anode
186:Eimac
139:anode
133:in a
98:JSTOR
84:books
202:load
70:news
38:any
36:cite
597:JIS
577:RMA
168:or
143:red
49:by
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224:,
129:A
310:e
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296:v
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114:(
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105:(
95:·
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