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The Mad Professor Old School 21 is just what it's name implies, 21 watts of tube tone in an elegant, old-school package. The folks at Mad Professor designed this amplifier for the player who prefers a touch-sensitive overdrive that responds to subtle variations in pick attack, and for those who like to adjust gain with the guitar's volume knob. The Mad Professor Old School 21's single channel and straightforward layout keeps things simple, with gain, three-band EQ, tone cut, and a Master Volume knob. A pair of 6v6's lend to the Old School 21's American-flavored clean tones, but when cranked up a whole new character develops; one of creamy, refined overdrive, with none of the "hair" or fuzzy qualities of some overdriven tube amplifiers. A Celestion G12H 30 watt speaker translates all the vintage tones with a furious low end chug and high end detail you'd expect from this classic speaker, making the Mad Professor Old School 21 a perfect match for the vintage-oriented guitarist who wants something on a whole new level.