A valve amplifier or tube amplifier is a type of electronic amplifier that make use of vacuum tubes instead of solid-state semiconductor devices (such as transistors). As any other electronic amplifier, they serve to increase the power and/or amplitude of a signal —typically (but not exclusively) sound or radio frequency signals.

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PEAVEY TRIPLE XXX SUPER 40EFX TUBE COMBO GUITAR AMP

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RCA 6L6 mono tube amp pair

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Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s. Valve amplifiers are used for applications such as guitar amplifiers, satellite transponders such as DirecTV and GPS systems, audiophile stereo amplifiers, military applications (such as target acquisition and radar) and very high power radio and UHF television transmitters.

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