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Topic: Thyratron

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	Thyratron Modulator
		The hydrogen THYRATRON MODULATOR is an electronic switch which requires a positive
		In contrast to spark gap devices, the hydrogen thyratron (figure 2-39) operates
		is applied to the control grid of the thyratron (V2) and instantaneous firing is obtained.
	www.tpub.com /content/neets/14184/css/14184_128.htm (205 words)

	Wide Bandwidth High Voltage Probes; Ignitron, Thyratron Drivers
		We also develop and manufacture support circuits for closing tubes including Thyratrons and Ignitrons (Thyratron drivers and Ignitron drivers).
		North Star builds two main types of high voltage probes - the PVM series designed for portability, and wide bandwidth, and the free standing VD series designed for long life and accuracy.
		Our thyratron drivers are available in styles with DC or pulsed preionization or without preionization.
	www.highvoltageprobes.com (415 words)

	thyratron - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "thyratron" is defined.
		thyratron : Encarta® World English Dictionary, North American Edition [home, info]
		thyratron : Dorland's Illustrated Medical Dictionary [home, info]
	www.onelook.com /?ls=a&w=thyratron (105 words)

	High Power Triggering Systems for Switches: Ignitrons, Thyratrons & Spark Gaps
		High power switches such as ignitrons, thyratrons, and spark gaps require unique high power triggering systems.
		Our triggers can all operate from 5 mA/5 V sources and/or fiber optic inputs.
		Thyratron / Ignitron / Spark Gap Drivers ⋅ Downloads ⋅ Useful Resources ⋅ Contact Us
	www.highvoltageprobes.com /thyratrons-drivers.html (203 words)

	thyratron on Coherent inc.
		By now, thousands of excimer lasers have been installed with MSC technology achieving typical thyratron lifetimes of a billion pulses.
		Thyratron based pulsed excimer lasers doubtlessly offer advantages for mostly scientific low to moderate repetition rate
		Stabilization · Optimum long-term stability Magnetic · Extended thyratron lifetime Switch Control (MSC) · 24/7 heavy-duty capability Advanced Internal · Extended hands-off Gas Processor laser operation 1.
	coherent.resultspage.com /lasers/thyratron (474 words)

	Hydrogen Thyratron Introduction - GLVAC
		Hydrogen thyratrons are widely used in scientific research, military, medical treatment and industry such fields, which include laser instruments, radar, pulse modulator, medical beeline accelerator, tommy bar protection and other electric instruments and equipments.
		Operation process of hydrogen thyratron is a process which gas changes into high conductive state from isolated high voltage state, transforms the storage energy during pulse time into strong power pulse output at the moment of the pulse.
		Structure of the grounded grid thyratron is the same as hydrogen thyratron, including cathode, anode and grid etc. Grid is used as discharge cathode in the grounded grid thyratron, so the grid is made of a special material of metal.
	www.glvac.cn /en/products/HydrogenThyratron/index.htm (1039 words)

	Biasing circuit for thyratron - Patent 4074202
		A multi-gap thyratron arrangement comprising a thyratron having at least one gradient-grid pair consisting of two adjacent electrodes between the cathode and anode of said thyratron and means for constantly biassing that electrode of said gradient-grid pair which is nearer the anode negatively with respect to the other electrode of said gradient-grid pair.
		A multi-gap thyratron arrangement as defined in claim 12 wherein said rectifier means comprises a first pair of diodes connected in series and poled identically across said rails, said charge forming device comprising a capacitor connected in series between said diodes and forming respectively therewith said first and second junctions.
		A multi-gap thyratron arrangement as defined in claim 14 wherein said rectifier means further comprises a first capacitor connected in series between said bridge circuit and said anode rail and a second capacitor connected in series between said bridge circuit and said cathode rail.
	www.freepatentsonline.com /4074202.html (2042 words)

	NationMaster - Encyclopedia: Thyratron
		Thyratrons evolved in the 1920s from early vacuum tubes such as the UV-200, which contained a small amount of argon gas to increase its sensitivity as a radio signal detector; and the German LRS Relay tube, which also contained argon gas.
		The gas in a thyratron is typically at a fraction of the pressure of air at sea level; 15 to 30 millibars (1.5 to 3 kPa) is typical.
		Thyratrons are also used in high-power UHF television transmitters, to protect inductive output tubes from internal shorts, by grounding the incoming high-voltage supply during the time it takes for a circuit breaker to open and reactive components to drain their stored charges.
	www.nationmaster.com /encyclopedia/Thyratron (1881 words)

	U.S. Patent: 5550430 - Gas discharge closing switch with unitary ceramic housing - August 27, 1996
		Thyratrons generally fall into two classes, depending on whether their housings are made of glass or ceramic material.
		The housings of ceramic thyratrons are typically made from at least two separate ceramic elements, i.e., an upper element between the anode and the control electrode and a lower element between the control electrode and the cathode.
		Because a portion of the control electrode of a traditional ceramic thyratron is exposed to the air at a location between the anode and the cathode, there is a possibility of arcing from the control electrode to the anode.
	www.everypatent.com /comp/pat5550430.html (3201 words)

	Alphatron Linac
		The thyratron uses a thermionic cathode heated by a radiant tungsten filament to an operating temperature chosen to ensure good electron emission with low evaporation of the active barium surface.
		The thyratron is at the heart of the modulator, controlling the release of the pulse energy and initiating the subsequent charging cycle.
		Thyratron commutation is initiated by fast rising trigger pulses to the grid(s) which fill the cathode/grid region with plasma.
	www.alphatronlinac.com /index.php?page=thyratron-prin (599 words)

	Thyratron various (Site not responding. Last check: )
		The advantages of Hydrogen filling in thyratrons are many.
		The first Hydrogen-filled thyratrons as the 3C45, 4C35 and 5C22 were developed by the MIT Radiation Laboratory came in use in radar pulse modulators at the end of WWII.
		The S1/3II came in use in the pulse modulator of the German Hohentwiel (FuG 200) airborne and submarine radar.
	www.xs4all.nl /~aobauer/thyratron_various.htm (234 words)

	Philo T. Farnsworth Fusion Discussion Board
		I can't comment immediately on the characteristics of this particular thyratron (CX2607), as EEV doesn't list all their offerings on their web site any more, and my old printout of their site is eluding me. At any rate, $70 for one of the big boys would be a steal.
		Also, the grid structure on triode thyratrons coasts up to a good fraction of the plate potential for about 50 nsec during the time the tube is turning on.
		Thyratrons are by nature unipolar devices, and do not like reverse current, as it tends to cause arcs to the plate, which eat holes and deposit metal on the walls of the tube, deteriorating the holdoff capability.
	www.fusor.net /old-boards/songs.com/msgs/msg-695.html (877 words)

	The Pennsylvania State University \| Stage Lighting Archives
		MAIN STAGE: Thyratron sys (thirty 2.5 kw, thirty 5 kw), 10 sc preset; patch panel; motor-d (15 sec) positioner control house (one 24 kw, three 6 kw, one 2.5 kw); Stage Manager's panel; Projection Room panel; Lecturn panel.
		Thyratron sys (eighteen 2.5 kw, eighteen 5 kw), 2 sc preset; Interplug panel; motor-d Autotrans house (one 6.6 kw, one 2-gang 6.6 kw, one 2.5 kw); remote stations; Stage Manager's console; portable Stage Manager's desk.
		VIII-Century 59363 HOBOKEN H. 48 drwgs Thyratron sys (thirty 5 kw), 2 sc preset; interplug panel; motor-d autotrans house (one 3-gang 6 kw, one 6 kw).
	www.theatre.psu.edu /facilities/lighting_archives/paper/sysdrawings.html (18299 words)

	Alphatron Linac
		Thyratrons, including glass types, are of robust design and construction and many types are used under arduous conditions experienced by military radars in aircraft, missiles, vehicles and naval guns.
		Thyratrons with adjustable reservoir systems should be operated at the recommended reservoir voltage supplied with the tube.
		Thyratrons with independent reservoir voltage control should not be set below recommended levels to shorten recovery time and achieve fault-free operation since low gas pressure will shorten the life of the thyratron.
	www.alphatronlinac.com /index.php?page=thyratron-ops (569 words)

	Sumlock Comptometer/Bell Punch Anita C/VIII
		A thyratron is a modified version of the small neon glow tubes typically used in as power-on indicators in older electronics gear.
		The majority (120) of the thyratron tubes reside on daughter cards that plug into edge-card connectors that are located on a main board that makes up the 'backplane' of the machine.
		Each of the thyratron tubes in the ring is connected to a digit electrode in the Nixie tube, so that each stage of the ring counter activates a single digit (zero through nine) in the Nixie tube.
	www.oldcalculatormuseum.com /anitaC-VIII.html (3953 words)

	U.S. Patent: 5044004 - Flash X-ray apparatus - *
		A low voltage power source is connected to heat the thyratron 22, and a high voltage direct current power source was connected to the thyratron 22 with an average available input power to support an operation of the thyratron 22 at a 100 Hertz repetition rate.
		The thyratron 22 is connected to the middle conductor 36 of the Blumlein device 32 to precharge the Blumlein to a positively high voltage and then fired to commutate the input power.
		The thyratron 22 was connected to a DC input power source, precharged the middle conductor 36 to 25 KV, and operated at 100 Hertz repetition rate.
	www.everypatent.com /comp/pat5044004.html (6223 words)

	Thyratron - InformationBlast
		A thyratron is a type of triode gas filled tube used as a high energy electrical switch capable of operation up to tens of kA (kiloAmps) and dozens of kV (kiloVolts).
		They are also found in high-power UHF televsion transmitters, where they are used to protect inductive output tubes from internal shorts, by grounding the incoming high-voltage supply during the time it takes for a circuit breaker to open and reactive components to drain their stored charges.
		Thyratrons have been replaced in most low and medium-power applications by corresponding semiconductor devices known as Thyristors (previously called Silicon Controlled Rectifiers, or SCRs) and Triacs.
	www.informationblast.com /Thyratron.html (174 words)

	The Colossus - Tony Sale
		The various components of Colossus were the optical reader system, the master control panel, the thyratron rings and their driver circuits, the optical data staticisors and delta calculators, the shift registers, the logic gates, the counters and their control circuits, the span counters, the relay buffer store and printer logic.
		Thyratrons are gas-filled triodes which strike a discharge arc between anode and cathode when the grid voltage is raised to allow electrons to flow.
		Each thyratron cathode is brought out to a patch panel which allows the cathode pulse to be connected to a common output line when a link is plugged into the patchboard.
	www.codesandciphers.org.uk /virtualbp/fish/colossus.htm (2322 words)

	The Philco Mystery Control Operation Page
		The second diode is used as a limiter to dampen strong peaks, which might cause the thyratron tube to continue firing over too long a period.
		If both grid and plate voltages are taken from the same a-c source their phase difference could be arranged so that the grid would permit current flow during the entire half cycle in which the plate is positive with respect to the cathode, so that no plate current would flow, or somewhere between these limits.
		When the thyratron lights, the holding relay closes and the stepping relay pushes a ratchet as many times as the pulses sent out by the pulser in the control box.
	www.philcorepairbench.com /mystery/operation.htm (1717 words)

	Radar Basics
		The network is discharged rapidly through a pulse transformer by the thyratron keyer tube to develop an output pulse, The shape and duration of the pulse are determined by the electrical characteristics of the pulse-forming network and of the pulse transformer.
		The thyratron requires a sharp leading edge for a trigger pulse and depends on a sudden drop in anode voltage (controlled by the pulse- forming network) to terminate the pulse and cut off the tube.
		When a positive trigger pulse is applied to the grid of the thyratron, the tube ionizes causing the pulse-forming network to discharge through the thyratron and the primary of the pulse transformer.
	www.radartutorial.eu /08.transmitters/tx06.en.html (686 words)

	Circuit for controlling the thyratron in a pulse controlled metal vapor laser - Patent 5243616
		It is thus the object of the invention to provide a control circuit for controlling the thyratron in the conventional laser pulse discharge circuit, thereby preventing the occurrence of latch-ups.
		A particularly simple circuit is obtained by detecting the voltage across the primary coil by means of a capacitive pick-up which forms a small capacity to the primary coil.
		The control circuit for giving off trigger pulses to the thyratron according to the invention comprises a capacitive pick-up PU, an amplifier/discriminator circuit connected to a synchronizing unit with input for an external trigger input signal and a trigger pulse circuit for giving off trigger pulses to the control terminal of the thyratron.
	www.freepatentsonline.com /5243616.html (802 words)

	Sisyphos
		Xor Thyratron was a distributed entity, who used several specialised crab-like robot bodies at any one time; eir specialisation in mineralogy and wide range of detection equipment led em to develop a novel aesthetic sensitivity.
		A new (tweaked) clade of humanity was developed for this high gee world; a metre tall and the same broad, they became known as Kobolds to the rest of the Terragen sphere; despite their short stature, they were strong and hardy and capable of great feats of strength in Earth-like gravity regimes.
		Thyratron was forced to act, and expelled eh-Nah and his jeweller warriors from the world of Sisyphos; as the crabvecs maintained their artificial environment the rebels had no choice but to depart.
	www.orionsarm.com /worlds/Sisyphos.html (941 words)

	Thyratron Tubes (Site not responding. Last check: )
		In essence thyratron tubes of were controlled versions of neon lamps built specifically for switching a lmost zero volts.
		Thyratron tubes are used typically in raadar pulse modulators closing applications.
		Examples of gas tubes are the thyratron and the ignitronIn essence thyratron tubes were controlled versions of neon lampsbuilt specifically for switching almost zero volts.
	tbbs.corluge.com /thyratron-tubes.html (137 words)

	The Rebuild of Heath Robinson
		A thyratron valve will strike and hold an internal arc discharge when there is a positive voltage on its anode and the grid voltage is raised towards the cathode voltage allowing current to start flowing.
		Unfortunately the only way to stop the discharge in a thyratron is to drive the anode negative with respect to its cathode.
		In the decade thyratron ring the thyratron which had been struck had to prepare the next thyratron in the ring to be struck on the next input pulse, but at the same time the next thyratron struck had to cause the pervious thyratron to be extinguished.
	www.codesandciphers.org.uk /virtualbp/hrob/hrrbld04.htm (781 words)

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