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The 12AX7 was originally intended as replacement for the 6SL7 family of dual-triode amplifier tubes for audio applications. As a popular choice for guitar tube amplifiers, its ongoing use in such equipment makes it one of the few small-signal vacuum tubes in continuous production since it was introduced.
The Chinese 6N4 (whose military issued variant is known by the designation 6N4-J) which is a pin-compatible replacement for the 12AX7 but has an amplification factor of 97.5 is the closest equivalent to the 6N2P.
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 ...
The changes gave Marshall amplifiers a more aggressive voice, which quickly found favour with players such as Eric Clapton, who would sit in Jim's shop practising. Clapton asked Jim Marshall to produce a combo amplifier with tremolo, which would fit in the boot of his car, and one of the most famous Marshall amps was born, the "Bluesbreaker ...
In common with all 'E' prefix tubes, using the Mullard–Philips tube designation, it has a heater voltage of 6.3V. It can produce 17W output in Class AB1 in push–pull configuration. Many guitar-amplifiers routinely run EL84 tubes in excess of 400VDC, with the Traynor Guitarmate reportedly putting out 25W RMS with 2 EL84s in a push–pull ...
THD Electronics, Ltd. is a manufacturer of amplifier accessories, and a former manufacturer of vacuum-tube guitar amplifiers.It is located in Seattle, Washington. It was founded in 1986 by President and CEO Andrew Marshall.