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A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet.
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.
A guitar amplifier amplifies the electrical signal of an electric guitar so that it can drive a loudspeaker at sufficient volume for the performer and audience to hear. Most guitar amplifiers can also modify the instrument's sound with controls that emphasize or de-emphasize certain frequencies and add electronic effects.
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]
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).
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.
Many treble boosters made in the 1960s were designed to not boost the signal much. Vox even decreased the output of the American made version of their treble booster because they were afraid that the signal would overload the amplifier's input stage. [1] Today, overdriving the input is considered one of the key features of a treble booster.
The original "up to eleven" knobs in the 1984 film This Is Spinal Tap "Up to eleven", also phrased as "these go to eleven", is an idiom from popular culture, coined in the 1984 film This Is Spinal Tap, where guitarist Nigel Tufnel demonstrates a guitar amplifier whose volume knobs are marked from zero to eleven, instead of the usual zero to ten.
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