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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.
This base type was used by many of the United States and most of the European tubes, e.g., 12AX7-ECC83, EF86 and EL84, produced commercially towards the end of the era before transistors largely displaced their use. The IEC 67-I-12a specification calls for a 36-degree angle between the nine pins of 1.016 mm thickness, in an arc of diameter 11. ...
Fischer's final design, the Songwriter 30, was licensed under Komet Amps. It features four cathode-biased EL84/6BQ5 output tubes and two 12AX7 preamp tubes. The amp's name is derived from its distinct clean sound, which Fischer felt was well-suited for singer-songwriters. Both amplifiers are still in production by their respective manufacturers.
A set of three matched Groove Tubes 12AX7 preamp tubes and two matched Groove Tubes EL84 power tubes, graded according to Fender's specifications, are used in all factory Blues Juniors. The Blues Junior uses a nonadjustable power tube bias (no way to vary the bias point), but it is fairly "hot" and can accommodate most matched pairs on the market.
ECC83/12AX7 (6057, M8137, B339) – High-mu dual triode for use as a high-gain AF amplifier, noval base ECC84 /6CW7 – Dual VHF triode for grounded-grid / cascode amplifiers in TV tuners; section 1 cathode is connected to two adjacent pins and the screen between the two sections is internally connected to the section 2 grid; noval base.
The 12AU7 and its variants are miniature nine-pin (B9A base) medium-gain dual-triode vacuum tubes.It belongs to a large family of dual-triode vacuum tubes which share the same pinout (RETMA 9A).
Specifications [ edit ] The Deluxe Reverb is a 22-watt tube amplifier (at 8 ohms), powered by a pair ("duet") of 7408/ 6V6 GT power tubes , one GZ34/5AR4 rectifier tube, four 7025/ 12AX7 tubes for preamplification and tremolo oscillation, and two 6201/ 12AT7 tubes driving the reverb and phase inverter circuits.
Rear view of a valve combo guitar amplifier. Visible are two glass 6L6 output tubes, six smaller 12AX7 preamp tubes in their metal tube retainers and both the power transformer and the output transformer. Guitar amplifiers are often designed so they can, when desired by the guitarist, distort and create a tone rich in harmonics and overtones.
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