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In this role it is widely used for the preamplifier (input and mid-level) stages of audio amplifiers. It has relatively high Miller capacitance, making it unsuitable for radio-frequency use. Typically a 12AX7 triode is configured with a high-value plate resistor, 100 kohms in most guitar amps and 220 kΩ or more in high-fidelity equipment.
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The Z-Wreck is a Vox AC30-style amp that was originally made for country guitar player, Brad Paisley. 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.
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.
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.
It was released as a response to the extensive number of modifications that were being applied to the regular Valve Junior. The circuitry was altered to include a second 12AX7 preamp tube, a gain control, and a spring reverb in addition to the single volume control, as well as a standby switch to preserve tube life. Thanks to a dual function ...