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12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain.Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.
Marshall quickly reverted to the older Celestions. [2] Still, some users prefer the pre-JCM800 amplifiers, claiming that those have a warmer, less "brittle" sound. [3] The amplifier was equipped with EL34 valves (tubes) for amps sold in the UK, Europe, and Canada. 6550 tubes for amps exported to the United States from approximately 1973 to 1985 ...
Marshall reissued the 2×12" Bluesbreaker [1] in 1989; the 4×10" was never reissued. [7] This version used 6L6 tubes. [7] [10] A reissue called the 1962 Bluebreaker was available in the 2000s and used 5881 power tubes. [11] An amplifier head, the 2245THW, was reissued in Marshall's "Handwired" series, with circuitry identical to the Bluesbreaker.
The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, which was owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...
Marshall updated the JCM lineup in the 1990s (JCM900) and 2000s (JCM2000) and developed new amp lines, like the DSL and JVM models. Many of the current and reissue Marshall amps continue to use valves (tubes) rather than transistors, as is common in this market sector. [5]
The transmitting tubes TT21 and TT22 have almost identical transfer characteristics to KT88 but a different pinout, and by virtue of their anode being connected to the top cap have a higher plate voltage rating (1.25 kilovolt) and a higher power output capability of 200 watts in class AB1 push–pull.