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Topic: Tetrode

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	Tetrode vs. Triode
		At lower volume levels, and with efficient speakers, the sound of the triode mode offers a level of delicacy, liquidity, and sweetness to vocals, chamber and jazz instrumental quartets and solo instruments with 3-D imaging in the mid-range that will get you even closer to the real event.
		Tetrode mode offers the detail, soundstage width and depth, and weight to the music that on large-scale orchestral or big band will transport you to the concert hall with all the visceral power and detail rendition of your favorite music.
		A changeover switch is provided on the back of the VTL amplifiers to make changing between the two modes a breeze - just power down the amplifiers, flip the switch to the desired mode, and power the amplifiers up again.
	www.vtl.com /pages/tetrode_vs_triode.html (161 words)

	Tetrode - Wikipedia, the free encyclopedia
		The first grid of a tetrode is the "control grid", because the voltage applied to it causes the plate current to vary.
		The tetrode tube was developed by Dr. Walter H. Schottky of Siemens and Halske GMBH in Germany during World War I. Thousands of variations of the tetrode design, as well as its later development the pentode, have been manufactured since then.
		A tetrode is a group of wire bundles used in electrophysiological studies in the neurosciences to record extracellular field potentials from nervous tissue, e.g.
	en.wikipedia.org /wiki/Tetrode (409 words)

	Tetrode -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-16)
		Tetrode (A semiconductor device capable of amplification) transistors also exist, although they are rarely used in modern electronics.
		The first grid of a tetrode is the "control" grid, because the (The rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts) voltage applied to it causes the plate (A steady flow (usually from natural causes)) current to vary.
		A tetrode is a group of wire bundles used in electrophysiological studies in the neurosciences to record (Click link for more info and facts about extracellular field potential) extracellular field potentials from nervous tissue, e.g.
	www.absoluteastronomy.com /encyclopedia/t/te/tetrode.htm (427 words)

	HNA Review of Books (Site not responding. Last check: 2007-10-16)
		Tetrode's large altarpieces for Delft were destroyed during the iconoclasm of 1573, probably prompting his move to Cologne, where he attracted the attention of another printmaker, Adriaen de Weerdt.
		As Goddard elaborates, the question of Goltzius's interest in Tetrode's sculpture becomes more interesting in the context of the so-called Haarlem Academy, for studies after plaster casts, and, indeed, sculptural models were a main avenue of access to antiquity for the artists of Haarlem.
		Goltzius's study of Tetrode is more than just a case of artistic influence or attraction but rather relates to the vogue for antiquity and the nature of studio practice around the turn of the seventeenth century.
	www.hnanews.org /2002/Goddard.html (625 words)

	Willem van Tetrode exposeerde bij Frick in New York (Site not responding. Last check: 2007-10-16)
		Tetrode's talent as a modeler in wax provided the link between the monumental marbles that he copied and restored and his original designs for bronze sculpture.
		Tetrode also depended on wax models as guides to restoring antiquities, for it was much easier to discern how to incorporate a missing head or limbs onto an antique fragment by working out the problem three dimensionally, in one's hands, using malleable wax.
		Tetrode's work inspired the great interest in small bronzes in the Italian manner that was to last for well over a century in the Netherlands.
	home.planet.nl /~marcel.tettero/Delft/WillemVanTetrode.htm (1839 words)

	Junction Tetrode Transistor
		The junction tetrode transistor is a close relative of the junction transistor recently described in a RECORD article+ by M. Sparks.
		In the junction tetrode shown in Figure 2(d), internal feedback is very greatly reduced by making two connections to the p-layer and by applying a few volts of bias between the two.
		The most significant electrical property of tetrode transistors is their ability to amplify broadband signals and to operate at very high frequencies.
	www.smecc.org /junction_tetrode_transistor.htm (1609 words)

	Van Tetrode bouwde aan sloten in Duitsland (Site not responding. Last check: 2007-10-16)
		Tetrode died as a victim of the plague which hit the area in 1580 and adds that he had built Arnsberg Castle.
		It is conceivable, therefore, that Van Tetrode was in some way involved in the design of the chimney-piece in his position as architect to Salentin von Isenburg.
		The pose of de Vries's large figure of Neptune on the Neptune fountain for King Christian IV of Denmark, completed in Prague in 1617, is similar to that of jupiter on the print, particularlv regardin,- the energetic forward thrust of their movement.
	home.planet.nl /~marcel.tettero/Delft/Arnsberg.htm (1501 words)

	Stereophile: Manley Laboratories 250 Neo-Classic monoblock power amplifier
		With both balanced and unbalanced inputs and an output stage capable of operating in both tetrode and triode modes, the Manley 250 Neo-Classic is four amplifiers in one chassis and thus represents four times as much labor in the measuring lab.
		The level is higher in triode mode than in tetrode, but both modes are respectively low into impedances of 4 ohms and higher, at least between the midbass and the top audio octave.
		There is a small rise in tetrode distortion in the low bass—unusually, this is greatest into 16 ohms—and a greater low-frequency rise in triode mode.
	www.stereophile.com /amplificationreviews/670/index5.html (813 words)

	Tetrode_Instructions (Site not responding. Last check: 2007-10-16)
		In practice, making a tetrode is akin to building a ship in a bottle; it is very delicate work and it is remarkably easy to make a mistake and ruin the previous three hours worth of work.
		The tetrode will be wound, and the winding will stop when the end of the tape is reached.
		Remove the tetrode from the solution and use the green wire and the orange wire that is connected to the vial.
	mccoy.ucsf.edu /tetrode/tetrode_instructions.htm (2541 words)

	United Press International - Entertainment(p) - Frick Collection shows rare Tetrode bronze
		It was cast like most other Tetrodes in a reusable mold that made multiple versions possible, some even cast by later artists, and is displayed for the first time with two other important variants, one loaned by the Rijksmuseum in Amsterdam and the other by the Los Angeles County Art Museum.
		When Tetrode returned to his native Netherlands in 1567, the small but animated bronzes he brought with him touched off a furor of collecting statuettes in the Italian style that lasted for nearly a century, then faded away so that Tetrode's name was known only to art specialists.
		Tetrode statuettes also influenced another later artist, Hendrick Goltzius, a 17th century Dutchman famed for his engravings of classical subjects including a number of studies of Hercules.
	www.upi.com /view.cfm?StoryID=20030811-031319-8981r (1032 words)

	Tetrodaeng
		As implies by its name, tetrode consist of 4 electrode, cathode, control grid, plate and screen grid.
		Tetrode was developed to elliminate the disadvantages of triode in case of interelectrode capacitance, especially the capacitance between grid and plate (Cgp) that cause inefficiency in triode working perfomance around high frequency region.
		There will be a situation when plate voltage move accros portion b-c of the curve and the tetrode output signal will be distorted.
	www.geocities.com /tube_theory/Tetrode.html (582 words)

	CNS98 (Site not responding. Last check: 2007-10-16)
		Though sorting of spikes in tetrode recordings is generally more reliable than that of traditional single-electrode recordings [1], the problem of assigning spikes to different neurons remains complicated and challenging.
		Our observations [2] show that noise in tetrode recordings in the cat visual cortex and in the LGN is highly correlated across channels (typical cross-channel correlation coefficient lies in the range of 0.7-0.95).
		Cross-channel correlation coefficients within the same tetrode appeared to be relatively high: 0.8-0.92 (as expected), while the coefficients of correlation across channels of different tetrodes were significantly smaller: 0.47-0.51.
	mccoy.ucsf.edu /Papers/Cns98/CNS98-paper.htm (1776 words)

	Cool Hunting: Tetrode Kink
		Atonal, noisy rock that's difficult to categorize, Melbourne band, Tetrode Kink, was formed in late 2005 by five unlikely lads who felt compelled to fuse their talent and tastes to create noise.
		From the darkest dungeon back rooms in pubs through to center stage at Melbourne's hidden-alley bars, the band are making an undeniable impact on a city within which underground music is rampant.
		An original and unique approach married with experimental technique and skill, Tetrode Kink create the type of music that could easily be aligned with Sonic Youth, Swans and the No Wave movement.
	www.coolhunting.com /archives/2007/05/tetrode_kink.php (596 words)

	Electron Beam Power Supply - Tetrode Tube - Theory of Operation
		The positive output is connected to the plate of a high-power tetrode tube.
		A power tetrode is used as the control element in a conventional series tube regulator configuration and is connected between the power supply positive output and ground.
		The tetrode also provides a means of interrupting the short-circuit, which results from high-voltage arcs to ground.
	www.thermionics.com /egun/ebeam_ps.htm (805 words)

	The Incredible World Of 'Shrooms (Site not responding. Last check: 2007-10-16)
		A tetrode wire is composed of a bundle of four individually insulated electrodes.
		One advantage of a tetrode is that the four wire tips are so close (150um for the moth tetrode), so they can detect overlapping hearing spheres.
		A tetrode wire is inserted in vivo--into the exposed brain of the live, thinking, conscious insect.
	student.biology.arizona.edu /honors2002/group14/methods.html (357 words)

	Intracellular Features Predicted by Extracellular Recordings in the Hippocampus In Vivo -- Henze et al. 84 (1): 390 -- ...
		The path of the extracellular electrode is marked by blood on withdrawal of the tetrode.
		Note the relatively good match of the derivative to the tetrode traces on the initial negative phase and mismatch on the later phases of the extracellular spike.
		To illustrate the spatial relationship of the neurons, the soma and proximal dendrites of cell 2 are superimposed (in white) on the image of cell 1.
	jn.physiology.org /cgi/content/full/84/1/390?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&searchid=QID_NOT_SET&stored_search=&FIRSTINDEX=0&volume=84&firstpage=390&journalcode=jn (7370 words)

	MIT OpenCourseWare \| Brain and Cognitive Sciences \| 9.96 Experimental Methods of Adjustable Tetrode Array ... (Site not responding. Last check: 2007-10-16)
		The tetrode array, used to record from multiple neurons in the brain, is the final project of the class.
		The course is a hands-on experimental laboratory class with some preparatory lectures and descriptive procedural handouts. Teams of students will embark an intensive effort to execute neurophysiological experiments from start to finish. This will include manufacturing and construction of the implanted recording and stimulation microdrive array, animal training, experiment preparation, running of behavioral experiments, and subsequent data post-processing.
		Due to the broad nature of tasks to be completed, coupled with the team oriented approach we will be employing, we are interested in students with a wide variety of laboratory experience and skill levels.
	ocw.mit.edu /OcwWeb/Brain-and-Cognitive-Sciences/9-96Experimental-Methods-of-Adjustable-Tetrode-Array-NeurophysiologyJanuary--IAP-2001/CourseHome (259 words)

	Hudson Review, The: Northernness and Other Considerations: At the Museums and Elsewhere (Site not responding. Last check: 2007-10-16)
		Together, the Tetrode and Goltzius exhibitions formed an intensive course in Dutch Mannerism-the high style art of the late Renaissance -with emphasis on the connections between Netherlandish artists of the period and their Italian colleagues, a relationship that has been considerably rethought during the past two decades.
		Many of the exhibited bronzes were reductions of famous works from antiquity, made to satisfy the appetites of eager collectors, such as the surviving portions of an astonishing ensemble commissioned by the Count of Pitigliano.
		At the Frick, a footnote to the Tetrode show, explaining bronze casting, introduced his fellow Netherlander, Goltzius, with a selection of his virtuoso engravings of Roman emperors and classical deities, all sporting mustaches more evocative of ancient Gaul than the age of the Caesars.
	www.findarticles.com /p/articles/mi_qa4021/is_200401/ai_n9354618 (954 words)

	The tetrode - Chapter 13: ELECTRON TUBES - Volume III - Semiconductors (Site not responding. Last check: 2007-10-16)
		As the name suggests, the tetrode tube contained four elements: cathode (with the implicit filament, or "heater"), grid, plate, and a new element called the screen.
		Similar in construction to the grid, the screen was a wire mesh or coil positioned between the grid and plate, connected to a source of positive DC potential (with respect to the cathode, as usual) equal to a fraction of the plate voltage.
		Two different strategies were developed to address this problem of the tetrode tube: beam power tubes and pentodes.
	www.allaboutcircuits.com /vol_3/chpt_13/4.html (357 words)

	Fall Exhibition at the Clark Presents Compelling New Evidence of the Connection between Goltzius and Tetrode
		A native of Delft, Tetrode spent time in Italy and in the 1560s introduced Dutch collectors to the genre of small bronze statuettes then fashionable in Italy.
		The theory that Goltzius saw—perhaps even owned—some of Tetrode's sculptures and used them as sources for his prints was first put forth in the 1970s.
		Another theory is that Goltzius and Tetrode encountered one another while they were both in Cologne in the 1550s.
	www.clarkart.edu /make_a_visit/press_releases/content.cfm?ID=121 (865 words)

	Computer Desktop Encyclopedia: tetrode@ HighBeam Research (Site not responding. Last check: 2007-10-16)
		A type of vaccum tube currently used in high-end audio amplifiers.
		A tetrode is like a triode with the addition of a "screen grid" between the control grid and the plate (anode).
		The screen grid is an electrostatic shield typically biased with a fixed voltage that isolates the control grid and protects it from voltage potential...
	www.highbeam.com /library/doc0.asp?DOCID=1P1:51036988&refid=ip_encyclopedia_hf (137 words)

	Thomas 6V6GT Push-Pull Beam Tetrode Power Amplifier
		This amplifier is a text book implementation of a basic beam tetrode push-pull amplifier with lots of global negative feedback.
		Output of the B+ HT supply is about 315VDC, with a slightly lower voltage provided for the tetrode screens and another for biasing the input and driver stages.
		Instead, a large 3A fuse is installed which permits convenient cathode current measurement (by removing the fuse and connecting an ammeter), as well as a mounting point for the ground bus bar.
	snow.prohosting.com /rknize/russ/electronics/tubeaudio/thomas/description.html (1991 words)

	Stereophile: VTL MB750 monoblock power amplifier
		A complete set of measurements was made on the VTL MB-750 in the unbalanced triode mode, with selected measurements repeated in the balanced triode and unbalanced tetrode configurations.
		DC offset measured 19mV triode and 13.4mV tetrode, though these are approximate maximum values; the readings varied radically (not unusual in a tube product).
		This overshoot is also visible on the 1kHz squarewave, tetrode (not shown), as a single spike on the leading corner.
	www.stereophile.com /amplificationreviews/152/index8.html (452 words)

	Accuracy of Tetrode Spike Separation as Determined by Simultaneous Intracellular and Extracellular Measurements -- ...
		Accuracy of Tetrode Spike Separation as Determined by Simultaneous Intracellular and Extracellular Measurements -- Harris et al.
		Accuracy of Tetrode Spike Separation as Determined by Simultaneous Intracellular and Extracellular Measurements.
		Wehr M, Pezaris JS, and Sahani M. Simultaneous paired intracellular and tetrode recordings for evaluating the performance of spike sorting algorithms.
	jn.physiology.org /cgi/content/full/84/1/401 (8235 words)

	EH 6550PowerOutputGraphs (Site not responding. Last check: 2007-10-16)
		All beam tetrodes are a bit nonlinear in their basic characteristics.
		Unlike the plain tetrode use, there is not any benefit in using a lower anode supply voltage because of the headroom restriction of the Eg = 0V character.
		Since the miller input capacitance is lowest in beam tetrode mode, the output tubes are very easily driven at high frequencies, so little drive current is required in the driver amp.
	www.turneraudio.com.au /htmlwebpgs02/eh6550pographs.htm (2907 words)

	Mister Transistor's Historic Semiconductors (Site not responding. Last check: 2007-10-16)
		The earliest tetrodes were point-contact transistors with two emitters, which must have been nearly impossible to manufacture!
		The other type of tetrode was an NPN grown-junction transistor with two bases.
		The second base electrode was biased at a constant voltage and altered the electrical behaviour of the transistor, thereby improving high-frequency performance.
	ourworld.compuserve.com /homepages/andrew_wylie/tetrodes.HTM (204 words)

	Class A, AB & C Operation of Tetrode Single-Ended RF Amplifiers
		However, if the anode voltage falls much lower than the screen then anode current will be diverted to the screen and the screen's maximum power rating may be exceeded.
		Beam tetrodes are better than pentodes in this respect and the instantaneous anode voltage may be allowed to fall to 50% or less of the DC screen volts.
		For a given tube and set of conditions, the maximum instantaneous control grid voltage sets the peak cathode current.
	www.smeter.net /amplifiers/tetrode1.php (1121 words)

	Screen Current and Grid Driven Tetrode Linear Amplifiers (Site not responding. Last check: 2007-10-16)
		One of my amplifiers is a grid driven tetrode linear -and, I've been tuning it incorrectly...
		It seems that for a grid driven tetrode linear amplifier, a certain amount of screen current is REQUIRED to make the tube operate at optimum linearity.
		The bottom line is that if you run a grid driven AB1 linear amplifier, you should be seeing zero grid current, recommended screen current, and using a regulated screen supply for the cleanest result.
	www.amfone.net /ECSound/K1JJ19.htm (252 words)

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