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12AX7
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==History== The 12AX7 is a twin triode basically composed of two of the triodes from a 6AV6, a double diode triode. The 6AV6 is a miniature repackaging (with just a single cathode) of the triode and twin diodes from the octal [[6SQ7]] (a double-diode triode used in AM radios), which itself is very similar to the older type 75 triode-diode dating from 1930.
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