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Power-tube distortion is required for amp sounds in some genres. In a standard master-volume guitar amp, as the amp's final or master volume is increased beyond the full power of the amplifier, power-tube distortion is produced. The "power soak" approach places the attenuation between the power tubes and the guitar speaker.
These amps were made from May 1982 to December 1985. Serial numbers started with 0100 and ended on 2390. This was Mesa/Boogie's first attempt at having a reissue of the Mark I. It had two cascading gain inputs and its controls were Volume(gain) 1, Volume(gain) 2, Master, Treble, Bass, Middle, Limit or Presence (depending on the version).
A post master volume, transformer coupled, guitar level effects loop is also provided. [10] In addition, the amp contains much of the same circuitry as the original Single Channel non-reverb amp. In 2020 Jim Kelley began building a two channel version of the Line Amp. Unlike the FACS Line Amp, these amps feature two distinct inputs.
The effect of the volume, gain and tone control knobs varies according to the selected amp model. The digitally modelled signal is fed into a class-A single-ended tube circuit, with a 12AX7 output tube driver, and a 6V6 output tube.
A Master Volume/BYPASS switch completely bypasses the Master Volume section allowing incredible levels of gain and sustain to be achieved. OP mode switch cut the amp's Output Power level in half (30 > 15 on the AC30, 15 > 7.5 on the AC15) allowing higher levels of saturation to be achieved at lower volumes.
The gain of a good quality full-range audio amplifier will be essentially flat between 20 Hz to about 20 kHz (the range of normal human hearing). In ultra-high-fidelity amplifier design, the amplifier's frequency response should extend considerably beyond this (one or more octaves either side) and might have −3 dB points < 10 Hz and > 65 kHz.
The tremolo circuit was removed. Gain, master volume, and presence controls were added. And the two channels were made switchable as opposed to the individual inputs on the Deluxe Reverb. The Deluxe Reverb II was effectively a completely different amplifier, and it was discontinued in 1986. This was the so-called "Rivera-era". [3]
Trainwreck amplifiers are renowned for their dynamic overdrive sound and response. They can deliver a wide range of clean signals and high-gain overdrive solely with the manipulation of the guitar's volume knob. Most Trainwreck amps have five control knobs (volume, treble, mid, bass, presence).
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