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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.
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.
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 ...
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.
During this time the amplifier's output was rated at 85 watts into a 4-ohm speaker load. The circuit used is commonly known as the AB763 circuit. Fender Twin Reverb amplifiers use four output tubes, of the 6L6GC type. [9] They use six preamp tubes, consisting of four 7025/12AX7 types [10] and two 12AT7 types.
The Hot Rod Deluxe is an all tube combo amp rated at 40 watts. It utilizes a single 12-inch Celestion A-Type Speaker. The Hot Rod Deluxe is a mono-channel amplifier featuring 3 switchable gain levels: "Clean", "Drive", and "More Drive" selectable on either the control panel or footswitch (if plugged in).
5751 is the designation for a low-voltage, low-noise avionics vacuum tube popular as a pre-amplification tube in guitar amplifiers.The 5751 is a modified version of the 12AX7 and, having a gain factor of 70-80 (as opposed to the 12AX7's 100), is used to "soften up a harsh modern amp".
An external speaker jack is located next to the output tubes in the back and allows the signal to be heard out of both the amplifier itself and the speakers to which it is connected (which must have a 4- or 8-Ohm impedance). The DeVille features a 60-watt valve amplifier with three 12AX7 preamp valves and two 6L6 output valves. Its circuitry ...
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