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The first version of the Marshall stack was an amp head on an 8×12 cabinet, meaning a single speaker cabinet containing eight 12" guitar speakers. After six of these cabinets were made, the cabinet arrangement was changed to an amp head on two 4×12 (four 12" speakers) cabinets to make the cabinets more transportable.
The Ampeg SVT is a bass guitar amplifier designed by Bill Hughes and Roger Cox for Ampeg and introduced in 1969. The SVT is a stand-alone amplifier or "head" as opposed to a "combo" unit comprising amp and speaker(s) in one cabinet, and was capable of 300 watts output at a time when most amplifiers could not exceed 100 watts output, making the SVT an important amp for bands playing music ...
This circuit was designed to emulate valve amplifier distortion (hence V-S for valve sound) but with controllable master volume, the V-S circuit was encased in a block of resin to prevent copying by competitors. All the amplifiers were housed in smart slim carryable heads and 2 x 12 or 1 x 15 combo enclosures.
In the early 2000s, the company worked with Bruce Egnater of Egnater Amplification to create the MTS (Modular Tube System) series of guitar amplifiers. These involve a single amp head consisting of the power amp and part of a preamp, and slots in the head (one for the RM20 head and combo, two for the RM50 head and combo and RM22 head, and 3 for the RM100 head and RM100C combo, and 12 for the ...
Peavey 6505 head and cab. The Peavey 5150 is a vacuum tube based guitar amplifier made by Peavey Electronics from 1992 on. The amplifier was initially created as a signature model for Eddie Van Halen. After Van Halen and Peavey parted ways in 2004, the name was changed to Peavey 6505 in celebration of Peavey's 40th anniversary (1965–2005).
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. The 2 ohm load rating is very stable (this amp actually operates at less than 2 ohms), enabling the use of multiple mix and match speaker systems to improve ...
The Flexi-50 amplifier head was released in 2003, and made its debut at that year's Music Live event in the UK. It is a 50-watt, class-AB amplifier, meant to “create an idealized (Marshall) ‘Plexi’ tone". [20] As a “subtle homage” to the Plexi, the Flexi's faceplate is gold Plexiglas. [20]
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 ...