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The Marshall Bluesbreaker is the popular name given to the Models 1961 and 1962 guitar amplifiers made by Marshall from 1964/65 to 1972.. The Bluesbreaker, which derives its nickname from being used by Eric Clapton with John Mayall & The Bluesbreakers, is credited with delivering "the sound that launched British blues-rock in the mid-1960s."
In comparison, if an external DI box is used, with the bassist plugging their bass into the DI box and sending the signal to their bass amp, the DI box signal would be the direct signal from the bass' pickups. With the external DI box approach, the sound shaping added to the bass' signal on the amplifier (e.g. boosting the preamplifier, adding ...
The 400 BH power amp module was used in a range of bass amps during the early 1980s, commencing with the MKIII Bass Head in 1979. The MKIV Bass Amp head unit, introduced in 1981, offers a range of functions. It is air cooled, features protection circuitry, and is capable of around 300/350 watts RMS safely into 2 ohms.
Some bass amps have a 15 or 20 dB pad which can be used to attenuate "hot" signals, such as basses with an internal preamplifier (depending on the model of amplifier, some brands may provide two inputs (high and low gain) instead of providing a "pad". This pad can be turned on using a button. Some bass amps have an even stronger pad, a 40 dB pad.
Upright bassists in jazz, folk, blues and similar genres may use a bass preamplifier, a small electronic device that matches the impedance between the piezoelectric pickup and the amp or PA system. Bass preamps also allow for the gain of the signal to be boosted or cut. Some models also offer equalization controls, a compressor, and a DI box ...
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In 1960, Ampeg introduced the B-15, a bass combo amplifier with an innovative flip-top function, invented and patented by Oliver. The B-15 was the first in the company's Portaflex series, and after becoming the preferred studio amp of session musicians like James Jamerson and Chuck Rainey.
The Hot Rod DeVille is a modified version of the earlier Fender Blues DeVille from the Blues amplifier line and has a higher level of gain in its preamplification signal. The DeVille incorporates a 60 watt amplifier and has been offered in two different models: a 212 , with 2, 12-inch speakers and a 410 , with 4, 10-inch speakers.