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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.
The 400 BH power amp module was used in a range of bass amps during the early 1980s, commencing with the MKIII Bass Head in 1979. The MKIV Bass Amp head unit, introduced in 1981, offers a range of functions. It is air cooled, features protection circuitry, and is capable of around 300/350 watts RMS safely into 2 ohms.
Vacuum tubes used in electric guitar amplifiers. Particularly the ones that played important role in shaping modern image of tube sound, ...
Thus Dumble amplifiers are the most expensive boutique amplifiers on the used market [3] and prices have risen rapidly. In 2012, Vintage Guitar magazine said the Dumble Overdrive Special is the most valuable in the product line, with used amplifiers fetching between $70,000 and $150,000. [4] Other models have sold for more. [5]
It is used in the power-output stages of audio amplifiers, most commonly now in guitar amplifiers, but originally in radios. The EL84 is smaller and more sensitive than the octal 6V6 that was widely used around the world until the 1960s. An interchangeable North American type is the 6BQ5 (the RETMA tube designation name for the EL84).
The tube amps in the series feature hand-wired eyelet board construction and are also becoming sought-after collectors items, due to the design and build quality. The range included one small tube-driven bass amp, the Bassman 20. There were also some solid-state amplifiers using the II moniker, such as the Harvard Reverb II. Other solid-state ...