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a tetrode is used when you need a screen grid tube, but a suppressor grid tube can't be used.
OK, but the question was "why use a tetrode instead of a triode?"
So, the answer...
1. A tetrode has a higher voltage/power gain than a triode.
2. A tetrode has less anode-grid feedback capacitance than a triode, and can operate in common-cathode radio frequency circuits without the neutralisation (or other corrective circuitry) that is needed by a triode.
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Does anybody know what a tetrode transistor was?
Yes. It was an early attempt to improve high-frequency operation.The device had the usual emitter-base-collector construction, but with *two* base connections, one at either side.In operation, a reverse bias applied to one of the base connections forced the current flow towards the other base, giving an artificially-narrow current path.This reduced capacitances in the device, giving higher operating frequencies.Concurrent, and later, developments gave greatly imrpoved perfomance from the conventional "triode" construction, so tetrode transistors became obsolete.Be aware that the tetrode transistor is basically a triode (three-electrode) device, unlike the vacuum tube tetrode, which has four terminals and gives radically different characteristics from the triode vacuum tube.
What is the advantage of triode?
With a diode tube you have no control over the current flow and it can only be used as a rectifier, where the triode consist of a control grid, to control the flow of electrons that will reach the anode, this make it possible to use the triode as a amplifier, compared to a transistor the control grid have the same function as the base of the transistor.Advantages?Over tetrodes and pentodes:1. Operation at higher radio frequencies,2. Lower noise figures,3. Simpler circuitry and only one power supply.
What problem in Triode vacuum tubes is solved by the screen grid in Tetrode vacuum tubes?
The screen grid shields the control grid from the plate, reducing capacitance and the Miller Effect, improving performance at high frequencies.It *also* greatly increases the intrinsic ("natural") gain.This is the amplification factor, "mu".A triode has a maximum mu of around 100, and as little as 2.0, depending on the valve type.A tetrode/pentode has a mu in excess of 500, often in the thousands.However, you won't usually find a specification for mu in tetrode/pentode data sheets, as it's impractical to design circuits with this amount of gain.Around 300~350 is the practical maximum.
When was Hugo Tetrode born?
Hugo Tetrode was born in 1895.
When did Hugo Tetrode die?
Hugo Tetrode died in 1931.
What is a tetrode?
A tetrode is an electronic tube with four electrodes; cathode, grid, screen, and plate.
How a triode works as basic amplifier?
A triode works as a basic amplifier by the use of radio waves. The radio waves produce a heat that is amplified.
What is the tetrode?
Twin-grid vacuum tube
The grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be?
A grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be passed through to the anode, but controlled by changes in grid voltage. The triode accomplishes this by amplifying signals applied.
What is an equivalent diode of a triode valve?
Hard to answer this one.The triode is a diode with a control electrode (the grid) added.The only useful answer is that a triode is a voltage-controlled doide.Try asking the question so that it can be answered more usefully.
Can be a triode tube PET 25W be damage due to electric fluctuation?
Can a triode tube PET 25W be damaged due to electric fluctuation
What is triode valve?
A triode valve is a three-electrode electronic device. It can amplify, oscillate or act a a switch. Most commonly, its three electrodes are contained in a completely-evacuated envelope (a near-perfect vacuum). The envelope may be of glass, ceramic or a metal-glass or metal-ceramic construction. Most commonly, the electrons needed for operation are produced by a heated filament or cathode. It is possible to do without the filament/cathode, but such devices are uncommon. The heated filament/cathode defines this as a *thermionic* triode. Some triodes do not use a pure vacuum. Instead, they use low-pressure gas, or mercury vapour, to allow them to operate at higher currents and lower voltage drops than vacuum triodes.
