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Topic: Suppressor grid

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	Patent Specification No. 507,239 (Site not responding. Last check: 2007-10-13)
		Grid 11 is connected though a high resistance 12 to a tapping on the potentiometer 13 connected between the source of positive potential and earth.
		The signal output from the cathode 31 of valve 34 is conveyed to the outer grid 43 of the hexode.
		The two screening grids 41 and 42 of the hexode are fed from a suitable high tension source and the cathode (40) potential is fixed by means of a potentiometer 46 and by-pass condenser 47 at the value a little positive of the required value of the fl potential of lead 58.
	www.doramusic.com /patents/507239.htm (7152 words)

	Pentode
		The purpose of inserting suppressor grid is avoiding secondary emission occurs in tetrode that reduce plate current, as seen on b-c curve from tetrode characteristic.
		Suppressor grid has negative voltage with respect to the others electrode because it connected directly to cathode.
		By applying suppressor grid, its negative voltage will push back secondary electron going back to plate and by this way dicreament of plate current will avoid to produce flat plate characteristic as seen of Figure 24.
	www.geocities.com /tube_theory/Pentode.htm (197 words)

	Eimac Care and Feeding of Power Grid Tubes (Site not responding. Last check: 2007-10-13)
		The third grid, the suppressor grid, is mounted in the region between the screen grid and the anode.
		The suppressor grid may be operated negative or positive with respect to the cathode, and may be operated at cathode potential.
		Since the suppressor grid reduces the effects of secondary emission, screen grid power supply requirement to provide a reverse electron flow path may be reduced.
	www.cpii.com /eimac/sec2-3.htm (295 words)

	Electronics 27
		Grid bias was required, to hold the grids negative, demanding low voltages at small currents, and the corresponding battery was the C battery.
		The suppressor grid of a pentode is always connected to the cathode, and is often not even brought outside the envelope, but is connected internally to the cathode.
		The suppressor grid, when connected to the cathode, does indeed send secondary electrons back to the plate, but it is evident that it also affects the distribution of the cathode current between plate and screen, and the effect of secondary electrons is not as great as it may seem.
	www.du.edu /~etuttle/electron/elect27.htm (23318 words)

	Suppressor grid - Wikipedia, the free encyclopedia
		A suppressor grid is a grid used in a thermionic valve (also called vacuum tube) to suppress secondary emission.
		In its simplest form, a suppressor grid is interposed between the screen grid and the anode (plate) of a tetrode, turning it into a pentode.
		Because the grid is negatively charged relative to both the anode and the screen grid, it repels any secondary electrons back to the anode preventing them from contributing to the screen grid current, and to any negative resistance characteristic.
	en.wikipedia.org /wiki/Suppressor_grid (137 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		I accomplished this by connecting the last two grids, the screen grid and the suppressor grid, so that they act together, as one grid.
		This is a diagram of the 6AU6 tube.
		I was also able to observe secondary emission with a 9.47 volt bias, a potential of 288 volts on the screen grid and up to 400 volts potential on the plate.
	faculty.frostburg.edu /phys/latta/ee/2ndemission/secondary6au6.htm (675 words)

	Colossus; Thomas H Flowers; Bletchley Park; Howard Champaigne; Allen W. M. Coombs; W. W. Chandler
		Better still, they were fed to one valve, but separately to the control and suppressor grids, for we had realized that a pentode valve could be cut off on either, thereby giving a logical "and" for upward‑going signals and a logical "or" for downward‑going signals.
		The suppressor technique was so useful, and we became so attached to it, that after the war we tended to avoid the double triodes used by most computer makers for their binary stores, on the grounds that such '1ong‑tailed pairs" left no separate electrode for switching purposes (apart from other disadvantages).
		The suppressor pulse was timed to outlast the drive pulse (40 versus 10 microseconds), so that when the pulse drive had been removed and equilibrium reestablished, the counter had moved on by one step only.
	www.ivorcatt.com /47d.htm (3255 words)

	AP3302 - Radar Theory
		It is locked to the trigger pulses in time and its pulse duration is determined by the time taken for the suppressor grid voltage to rise to the anode current cut-off level, i.e.
		In the stable state, before the application of a trigger pulse to the suppressor grid, the valve is conducting normally.
		The grid voltage Vg1 is held at zero volts relative to its cathode by grid current limiting via R1.
	www.radarpages.co.uk /theory/ap3302/sec2/ch8/sec2ch8p137.htm (730 words)

	Vacuum Tube Theory
		In a triode, the three elements, anode, grid and cathode are made of metal and separated by a dielectric, the vacuum.
		The suppressor grid is usually internally connected to the cathode and is made with wider mesh spacing then the other two.
		Electrons that are emited from the sides of the of the cathode are repelled away from the grid supports and forced into the main electron stream by the negative charge on the beam-forming plates.
	www.lh-electric.4t.com /vt_primer3.html (791 words)

	Vacuum tube (Site not responding. Last check: 2007-10-13)
		De Forest discovered that the current from filament to plate depended on the voltage applied to the grid and that current drawn by the grid was very being composed of the electrons which are by the grid.
		The positive voltage on second grid accelerated the electrons causing them strike the anode hard enough to knock secondary electrons which tended to be captured by second grid reducing the plate current and amplification of the circuit.
		The additional grids were all control grids " with different signals applied to each In combination with each other they create single combined effect on the plate current thus the signal output) of the tube The heptode or pentagrid converter was the most common of these.
	www.freeglossary.com /Pentode (2399 words)

	Introduction to Radio Equipment - Chapter 14
		In other pentodes, the suppressor connection is brought outside to a pin connection in the base of the tube.
		The way the suppressor grid reduces the effect of secondary emission from the plate can be understood by examining figure 108.
		The openings in the grids are arranged in such a manner as to cause the electrons to form into LAYERS or SHEETS as they pass between the windings on their way to the plates.
	www.hnsa.org /doc/radio/chap14.htm (1830 words)

	Multi Grid Tubes.
		The second grid severely reduce the gain of the tube unless it was placed at a high potential, equal to or even higher than the plate.
		In a pentode the screen grid is sitting there at a positive potential and because the plate voltage is going up and down with signal the screen grid may be, at that instant, more positive than the plate.
		The wires of the suppressor are widely spaced as compared to the control and screen grids so there is little effect on the high energy electrons coming from the cathode on their way to the plate.
	www.angelfire.com /electronic/funwithtubes/Basics_05_Multigrid.html (1938 words)

	Amplifiers and more complicated valves
		This grid is held at a steady potential midway between that on the anode and the cathode or control grid, so tends to ‘shield’ the control grid from seeing the changes in potential of the anode.
		The Suppressor Grid is normally connected to the same potential as the cathode so as to sweep away any unwanted electrons liberated from the anode.
		The Screen Grid is normally connected to a steady potential somewhere in between the anode and cathode potentials, and shields the input signal from seeing a large input capacitance.
	www.st-andrews.ac.uk /~jcgl/Scots_Guide/audio/part9/page3.html (1233 words)

	What does parasitic suppressor do?
		While the grid is grounded at lower frequencies it is often not effectively grounded at very high frequencies.
		A "parasitic suppressor" is a circuit that adds dissipative resistance to a connection path in an amplifier or oscillator.
		A suppressor is normally placed in the lowest impedance path that is involved in feedback causing unwanted instability.
	www.w8ji.com /what_does_parasitic_suppressor_do.htm (1239 words)

	[No title]
		For a twin triode such as a 12AU7 the first section (pins 6, 7, 8) should be treated as a single triode where row 7 is to be used for the plate, row 3 is to be used for the grid and row 4 is to be used for the cathode.
		When switch C-16 and the associated circuitry for the negative grid bias is used (see paragraph 5.57) switch J-16 will provide about 50 VDC negative on the suppressor row 6.
		The grid bias voltages are obtained according to the formula: Ec = 150R / (R + 15, 000).
	www.spiritone.com /~nabil/hickok/howto.txt (3257 words)

	Tubes 201 - How Vacuum Tubes Really Work (Site not responding. Last check: 2007-10-13)
		A grid of wires between the filament (or cathode) and the plate is negative, which repels the electrons and hence controls the current to the plate.
		A secondary effect of the screen grid is to reduce dramatically the influence of the plate voltage on the current flow, since the cathode is shielded from the plate by not one but two grids, and their screening effect is multiplied.
		When the screen grid voltage is higher than the plate, electrons emitted from the plate by secondary emission, as it is struck by the energetic primary electrons, are attracted back to the screen grid instead of returning to the plate as occurs in a triode.
	www.john-a-harper.com /tubes201 (10896 words)

	Tetrode - Wikipedia, the free encyclopedia
		the grid nearest the cathode, is the "control grid", because the voltage applied to it causes the plate current to vary.
		The screen grid is connected to a positive voltage, and bypassed to the cathode with a capacitor.
		However, in many applications the tetrode kink is undesirable and therefore a further, third, grid called the suppressor grid was added; the resulting vacuum tube is called a pentode.
	en.wikipedia.org /wiki/Tetrode (489 words)

	The World of Electron Tubes and Valves (Site not responding. Last check: 2007-10-13)
		Hence, when the voltage on the grid is varied in accordance with a signal, the plate current varies with the signal.
		When a beam power tube is designed without an actual suppressor grid, the electrodes are so spaced that secondary emission from the plate is suppressed by space-charge effects between screen grid and plate.
		The screen grid and the control grid are spiral wires wound so that each turn of the screen grid is shaded from the cathode by a grid turn.
	www.ginko.de /user/franz.hamberger/roehren/eintro.html (4203 words)

	Amplifiers (Site not responding. Last check: 2007-10-13)
		To improve on the tetrode, a vacuum tube with a second grid, a third grid was added called the suppressor grid.
		This grid was placed in between the anode and the screen grid, the grid added to the tetrode (See Figure 2).
		The supressor grid is kept at a relatively low negative voltage to repel and reflects any secondary electrons that leave the anode as it is heated by electron impact when the electron current in the tube is high.
	members.aol.com /Martinlc/amps.html (1116 words)

	Audio Synthesis via Vacuum Tubes
		Another grid was added, to absorb electrons which bounced off the plate (this was the cause of nonlinearity and a huge 'kink' in the plate characteristics of the tetrode).
		Nearly all pentodes have their suppressor grid internally connected to the cathode, which is the normal operating scheme for pentodes in RF and audio use.
		The gain of each grid descends as one moves out from the cathode; control (pin 9) is highest in gain and the usual signal input; the screen (pin 1) is much lower in gain; and the suppressor (pin 8) is very low in gain.
	www.cgs.synth.net /tube/vca.html (1179 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		That way, by applying a signal to the control grid, you can control how many electrons leave the plate, and then the final voltage output since it is directly proportional to the number of electrons passing through, better known as the current.
		A large potential is placed across the screen grid resulting in an electric field in the same direction as the field produced by the plate.
		Then, with an increase in the control grid potential, the resultant net field between the control grid and the cathode will be determined by the control grid and not much affected by the plate because the potential is so much higher there than across the plate.
	faculty.frostburg.edu /phys/latta/ee/2ndemission/generaltube.htm (736 words)

	Valves & Tubes. What use are they?
		If a high freq was fed in the grid, the amplified high freq on the plate was fed back to the grid by the inherent grid to plate capacitance making the small G to P capacity appear bigger than it really was.
		The plate of the Triode was moved even further away from the filament and another grid called a screen-grid was placed between the control-grid and plate to shield the control-grid from the plate.
		It is the fact that, when the grid requests more current, the plate voltage falls which means that, as the plate is the only available attractor, this drop in plate voltage reduces the amount of current available.
	locofonic.alphalink.com.au /valves.htm (13482 words)

	Estate Technical Notes English (Site not responding. Last check: 2007-10-13)
		The grid, which lies next to the cathode, we named the control grid.
		The third grid, called the suppressor grid, suppresses the electrons rebounding from the anode.
		the suppressor grid which suppresses rebounding electrons from the plate, could by special physical arrangement of the grids reach the point where no electrons were lost between anode and screen grid and the tube became enormously more powerful.
	www.oneillselectronicmuseum.com /notes5eng.html (197 words)

	ESP Amplifier Basics - How Audio Amps Work (Part 1)
		If the voltage on the grid were to be varied, then the cathode to anode current must also vary, and an amplifier is born.
		Because the signal voltage on the grid is "fighting" the attempt of the cathode resistor to maintain the current through the valve at a constant value, this is a form of feedback.
		The second grid (called the screen grid, or just screen) increases the gain of the valve dramatically, while the third grid, the suppressor, prevents what is called "secondary emission" from the plate.
	sound.westhost.com /amp-basics1.htm (3111 words)

	Powrtron Amplifier Part 4 (Site not responding. Last check: 2007-10-13)
		In the pentode (used in audio), the suppressor grid is tied internally to the cathode.
		The purpose of the suppressor grid is to suppress secondary electron emission from the plate.
		As the output tubes differ in their output using the same bias voltage, this means of bias control should be modified with a means of adjusting the output tube bias to assure that the tube current on both output tubes is equal.
	www.cosmos2000.org /audio/powrtron4.htm (1627 words)

	se100
		The control grid, between the cathode and plate, is made from very fine wire that is wound on two side posts that usually extend the length of the cathode.
		The grid wires are widely spaced to allow electrons to flow to the plate unimpaired, except when a negative DC voltage is applied to that grid.
		Capacitance between the electrodes (plate to grid, grid to cathode, and plate to cathode) is undesirable, and the main source of instability due to capacitive coupling.
	www.positive-feedback.com /Issue18/se100.htm (2357 words)

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