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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. 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 ...
The "Tweed" 5F10 model, [2] launched in 1955, but not in time for the Fender catalog of that year, [3] was a 10-watt amplifier utilising a 6AV6 (from 1956 a 6AT6) preamplifier tube, 12AX7 phase inverter tube, [note 1] a pair of 6V6GT power amplifier tubes, and one 5Y3GT rectifier tube, [4] with a Jensen P10R 10-inch speaker. The amplifier had a ...
It has five 12AX7 tubes in the preamplifier. The power amplifier uses four 6L6GC tubes in the power section in class AB. It has 120 watts RMS output power, into 16, 8 or 4 Ohms. The effects loop can be bypassed with a footswitch. It features separate inputs for both high and low gain. The amplifier has two channels, rhythm and lead.
12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature nine-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7.
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.
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.
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