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While being optional at the lower end, external power supplies are obligatory with the flagship models, from the NAC 52 (1990) to the NAC 552 (2002). [8] The 552 was designed to work with an external PSU with an 800VA toroidal transformer that Naim says has enough capacity to supply a 300–400 W power amplifier. [25]
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.
In 1967-1968 The Who used the WEM (Watkins Electric Music) Audiomaster five-channel mixer and multiple WEM 100-watt transistor PA amplifiers chained together as their sound system. [4] In the concert movie Pink Floyd: Live at Pompeii (1972), the band is shown using WEM PA equipment as it performs in the ruins of an ancient amphitheatre in ...
The 3220PE and 3225PE (PE being 'Power Envelope') are further improved versions of the 3020E and 3020i respectively, sharing circuit boards with the 3020 models, the main change being a different "dual voltage" transformer and improved power supply design. [20] [21] A 7175PE receiver model was also launched.
For most audio applications more power is needed at low frequencies. This requires a high-power amplifier for low frequencies (e.g., 200 watts for 20–200 Hz band), lower power amplifier for the midrange (e.g., 50 watts for 200 to 1000 Hz), and even less the high end (e.g. 5 watts for 1000–20000 Hz).
The output stage is biased into pure class A; traditionally it used triode-connected beam tetrodes or pentodes. With American 807 or British KT66 valves (Williamson recommended the latter type [61]) and specified power supply the amplifier delivered 15 watts of output power. Further increase in output, according to Williamson, required use of ...