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Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 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 dual channel amplifier [9] uses pre-amp valves (most specifically the EF86 pentode) that are associated with smaller Vox amps. [10] The range includes 15, 30, and 100-watt models in both head and combo form. The 15 and 30-watt combos were called "substantial amps that provide substantial tones" in Vintage Guitar. [2]
In 2016, Marshall introduced the CODE series of modelling amplifiers, ranging from the 25-watt Code 25 (single 10-inch speaker), 50-watt (single 12-inch speaker) to the 100-watt Code 100 (available as either a 2×12-inch combo or as a head unit).
The key to understanding this efficiency without churning the actual numbers is that we have a 400-watt-capable amplifier but with the efficiency of a 100-watt amplifier. This is because the waveforms of music contain long periods under 100 watts and contain only brief bursts of up to 400 watts – in other words, the losses at 400 watts are ...
Williamson's former employer, General Electric Company, followed suit and published a reference "30-Watt Williamson" design built around a pair of ultralinear-connected KT88. [117] The original Williamson amplifier lost the race, just like alternative designs by Peter Walker and Frank McIntosh . [ 118 ]
The human ear perceives a 5-watt amplifier as half as loud as a 50-watt amplifier (a tenfold increase in power), and a half-watt amplifier is a quarter as loud as a 50-watt amp. Doubling the output power of an amplifier results in a just noticeable increase in volume, so a 100-watt amplifier is only just noticeably louder than a 50-watt amplifier.