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In general, the power amplifier is the last 'amplifier' or actual circuit in a signal chain (the output stage) and is the amplifier stage that requires attention to power efficiency. Efficiency considerations lead to the various classes of power amplifiers based on the biasing of the output transistors or tubes: see power amplifier classes below.
Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus One hi-fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.
The II Series amplifiers [8] were produced from 1982 until 1986, being the last Fender amps to be made at Fullerton. The specifications for these amplifiers, and leadership of the design team, came from Paul Rivera (then marketing director) and are known as Fender Rivera era amplifiers.
The 901 Series, released in 1968, was an unconventional design consisting of two floorstanding speakers and an active equaliser. The equaliser, connected between pre-amplifier output and power amplifier input, effectively flattens the speaker frequency response. [26]
Dumble was a guitar amplifier manufacturer in Los Angeles. A Dumble Overdrive Special . In a one-person operation, Alexander "Howard" Dumble (June 1, 1944 – January 16, 2022) [1] [2] made each amp personally. Thus Dumble amplifiers are the most expensive boutique amplifiers on the used market [3] and prices have risen rapidly.
Founder of Sansui, Kosaku Kikuchi AU-666 amplifier 1970 [1] Sansui 9090DB Stereo Receiver (1975) Sansui QRX-5500 Quadrophonic Receiver D-X301i Cassette Deck with last logo from 1987 [2] Sansui Electric Co., Ltd. (山水電気株式会社, Sansui Denki Kabushiki-gaisha) was a Japanese manufacturer of audio and video equipment.