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The 12AX7 is a high-gain (typical amplification factor 100), low-plate-current triode best suited for low-level audio voltage amplification. 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.
Musical Fidelity's first product was "The Preamp", which incorporated moving coil and moving magnet pre-amplification and a single line-level ‘Tuner’ input. This was originally designed to overcome his dissatisfaction with the Michaelson & Austin TVP-1 pre- amplifier.
PS Audio is an American company specializing in high-fidelity audio components (also known as high-end audio) equipment for audiophiles and the sound recording industry. It currently produces audio amplifiers, preamplifiers, power related products, digital-to-analog converters, streaming audio, music management software and cables.
All amps are individually made: "it's possible that no two Trainwreck amplifiers actually have the exact same circuit". They are usually equipped with three 12AX7 preamp tubes. [10] Fischer made three kinds of models: Express; two EL34 or two 6V6 output tubes. Two 12AX7 preamp tubes and one 12AX7 phase inverter. (Highest-gain amplifier in the ...
An example of a typical high-end stereo preamplifier.. A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1]
[citation needed] The 5150 II, which contains an extra preamp tube for more headroom and gain on the Rhythm channel, is the old equivalent to the new 6505+. [citation needed] In 2010, Peavey released a new amplifier for the 6505 line, the 6534+. It is much like the 6505+, but the 6534 has EL34 power tubes instead of the 6L6 power tubes on the ...
Some hybrid amp heads have a bypass switch, so that the tube preamp can be bypassed, if the tube breaks or develops a technical problem. The tube preamplified signal in a hybrid amplifier head is then sent to a solid state power amplifier. Compared with tube power amps, solid state power amplifiers are more reliable, require less maintenance ...
Vox soon tired of the problem so to cure AC30/4 reliability issues caused by the troublesome EF86 preamp tube, [4] in late 1960 Vox redesigned the preamp circuit, replaced the EF86 with an ECC83 (12AX7), and released this new design as the AC30/6. The AC30/6 was now an amp with three channels, each channel having two inputs.
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