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A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.
A valve audio amplifier or vacuum tube audio amplifier is a valve amplifier used for sound reinforcement, sound recording and reproduction. Until the invention of solid state devices such as the transistor , all electronic amplification was produced by valve (tube) amplifiers.
12/01/2020 MA352 Integrated Amplifier named "Best Hybrid Amplifier 2020" by Hi-Fi World. [99] 12/10/2020 C53 Stereo Preamplifier named "2020 Best High-End Stereo Preamplier" by Secrets of Home Theater and High Fidelity. [100] 06/08/2021 MA12000 Hybrid Integrated Tube/Solid State Amplifier awarded prestigious "Applause" award by StereoNET UK. [101]
Since the 1950s the vast majority of high-quality valve amplifiers, and almost all higher-power valve amplifiers have been of the push–pull type. Push–pull output stages can use triodes for lowest Z out and best linearity, but often use tetrodes or pentodes which give greater gain and power.
In this role it is widely used for the preamplifier (input and mid-level) stages of audio amplifiers. It has relatively high Miller capacitance, making it unsuitable for radio-frequency use. Typically a 12AX7 triode is configured with a high-value plate resistor, 100 kohms in most guitar amps and 220 kΩ or more in high-fidelity equipment.
A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...
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