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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.
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 ...
The amplification factor of 6N2P is 98 which is marginally lesser than 12AX7, its higher heater current draw is similar to a 5751. 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.
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.
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.
The DeVille features a 60-watt valve amplifier with three 12AX7 preamp valves and two 6L6 output valves. Its circuitry includes full PCB with valves and pots mounted directly to the circuit board. The 410 utilized 10" Fender Special Design speakers made by Eminence and was offered for versions II and III.
The specifications for these amplifiers, and leadership of the design team, came from Paul Rivera (then marketing director) and are known as Fender Rivera era amplifiers. Some amplifiers in the series used the II moniker; the Champ II, Princeton Reverb II, Deluxe Reverb II and Twin Reverb II, while others such as the Concert and Super Champ did ...
The Super Champ utilized 1× 12AX7 for the first and second stage preamp, a 1× 12AT7 for spring reverb driver tube, whilst the three sections of the triple-triode 6C10 compactron serve as a recovery for the spring reverb, as a driver for the phase inverter, and as a split-load phase inverter. When the volume knob is pulled, some signal from ...
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