0
It's a thermionic valve/electron tube with *two* triodes in the one envelope.
Examples: 3A5, 6J6, 6SN7/6SL7, 12AU7/12AX7, ECC32, ECC82.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
What is a TRIODE and what are its uses?
A triode is a vacuum-tube (US) aka valve(UK) with three electrodes : an anode, a cathode and a grid. The cathode is heated electrically which boils off a cloud of electrons. The anode is made positive ( typ. 100-500V) which attracts the electrons towards it. The grid is an open structure, usually of thin wires, placed between the anode and cathode, but nearer the cathode. If a negative voltage is applied to the grid the current flow through the tube is reduced. The more negative, the less current. Prior to the development of transistors, tubes were used for all things in radio,TV and electronics. Different tubes had different numbers of electrodes; the triode was particularly suited to high power amplifiers, especially at radio frequencies. Triodes are still used today by shortwave radio stations, and for RF heating equipment.
What is a crystal triode?
A crystal triode is the old term for transistor. Crystal diodes were well established by the time transistors were invented, so using vacuum tube terminology, the logical name for a diode whose current could be controlled by a third element was "crystal triode".
What is the full form of TRIAC?
TRIAC is the word derrived from the 2 words TRIode and AC.
What are the advantages of using transistor as an switch instead of diode?
1. A transistor *is* a triode- this is the general name for any three-electrode electronic device. 2. Most people understand "triode" to mean a tride vacuum tube/valve. 3. The transistor (i) needs no heated filament/cathode, so it uses much less power than a valve triode, (ii) because of (i), transistors do not "burn out" with age, so they have much longer lifetimes, are much more reliable, and generate much less waste heat, (iii) transistors can operate at much lower power than triode valves, and at much higher frequencies, (iv) transistors can be made much smaller than triodes, by a factor of many tens of thousands, (v) from early on, transistors were much cheaper than triode valves.
What is triode pentode?
A triode pentode is a thermionic valve, also known as a vacuum tube (USA). It comprises a triode which has three electrodes and a pentode which has five electrodes, both sections of the valve are enclosed in a single glass envelope. They were often used in domestic audio amplifiers in the 'valve era' where the triode section acted as a preamplifier to increase the amplitude of the low level signal from the input source such as a tape head or a crystal pick-up; and the pentode section provided sufficient power amplification to drive a small loudspeaker. Minimising the number of valves in such designs significantly reduced the overall power consumption, heat dissipation and manufacturing cost of the equipment. It also reduced the retail price, making record players more affordable to the domestic consumer. Triode pentodes are still used in some current production, British built Hi Fi amplifiers because, with careful attention to the design, they can be configured to out-perform double triodes (two triodes in a single envelope) in the driver stages. Submitted by Graham Stannett (Croxley Audio). I would be grateful if you would be kind enough to contact me if you wish to amend this WikiAnswer or if you would like more information regarding valve amplifiers.
Was the first amplifying tube a triode?
If by triode, you mean "a three-electrode tube", then yes. You need a source of current into the device, a control electrode, and an "outlet" for the controlled current. Although there were radically different types of construction, all early amplifying tubes were triodes of some kind.
Who is the inventor of vacuum tubes?
Sir John Ambrose Fleming patented the thermionic diode in 1904. Then Lee DeForest put a control grid into it to create the triode in 1906.
What are the function of vacuum tubes?
The earliest vacuum tubes were used as direct display devices, and also as rectifiers of alternating current. In 1906 Lee De Forest invented the triode valve, from which all subsequent vacuum devices have devolved. The triode allowed the electronic amplification of electrical signals, and from this, our modern communications industries have developed. Amplifiers may be made into oscillators by applying feedback. The triode may also be made into a switch (of various sorts), and this is the base on which the digital industries are based. This craft embodies the technologies of electronics, combined with Boolean algebra and signal theory. Quite complex assemblies of valves may be combined, such as triode-hexode combinations. Very large power may be controlled by the triode principles. Modern Thyristor assemblies - today's solid-state equivalent of the vacuum tube - may be used to control Megawatts of power in High Voltage Direct Current transmission systems.
What tubes should you put in a mesa boogie dual rectifier?
12AX7's and 6L6's.
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.
Who was the inventor of the vacuum tubes?
Lee de Forest was the inventor of the first electronic amplifying tube, the triode. His understanding of how his invention worked was far from correct, but nevertheless he had invented the first electronic valve. Rectifying tubes had been invented earlier by J A Fleming, and it was these that de Forest improved upon - magnificently.
Why you use tetrode instead of triode?
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.
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.
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
How many KB is a vacuum tube?
Kilobytes and vacuum tubes are not in the same category. At best, a twin triode vacuum tube is a single flip-flop and can hold 1 bit of information, making a vacuum tube about 0.000122 of a kilobyte.
What is a TRIODE and what are its uses?
A triode is a vacuum-tube (US) aka valve(UK) with three electrodes : an anode, a cathode and a grid. The cathode is heated electrically which boils off a cloud of electrons. The anode is made positive ( typ. 100-500V) which attracts the electrons towards it. The grid is an open structure, usually of thin wires, placed between the anode and cathode, but nearer the cathode. If a negative voltage is applied to the grid the current flow through the tube is reduced. The more negative, the less current. Prior to the development of transistors, tubes were used for all things in radio,TV and electronics. Different tubes had different numbers of electrodes; the triode was particularly suited to high power amplifiers, especially at radio frequencies. Triodes are still used today by shortwave radio stations, and for RF heating equipment.
Did vacuum tubes replace transistors?
No the Transistor replaced vacuum tubes in 1947 and later by integrated circuits.This was answered by ...John Nelson Brundage the third seventh grader at GAISER MIDDLE SCHOOL, VANCOUVER SCHOOL DISTRICT, VANCOUVER WASHINGTON
