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Chapter 1: Fundamentals of Amplification
www.valvewizard.co.ukThe most common triode type found in guitar amps is the ECC83 / 12AX7, while the ECC81 / 12AT7, ECC82 / 12AU7 and 12AY7 occasionally make an appearance. The consistent use of the same type of valves is partly historical, since many modern amplifiers are derivations (or merely copies!) of a few classic Fender amps.
ECC83 - r-type.org
www.r-type.orgECC83 page sheet date 1 1 1954.11.11 2 1 1960.05.05 3 2 1954.11.11 4 2 1960.05.05 5 3 1955.02.02 6 3 1960.05.05 7 4 1955.02.02 8 4 1960.05.05 9 A 1953.06.06