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In 1992, Guitar Player Magazine conducted a one-to-one test with a 1973 JMP Marshall 50-watt amplifier head, and found the two sounded “very close”. [11] From 1990-1991, a very limited run of THD 50-watt bass amplifiers was also produced. These bass amplifiers were dubbed the “Classic Bass Head”. [1]
The later MKII and MKIII models have 4 channels to meet the varied input needs of musicians. While the amp's output provided larger sound than the Vox AC30, the tube design called for two EL34 output tubes to achieve the power needed for tonal clarity. The preamp tubes were consistently one ECC82 (12AU7) tube and three ECC83 (12AX7) tubes.
The human ear perceives a 5-watt amplifier as half as loud as a 50-watt amplifier (a tenfold increase in power), and a half-watt amplifier is a quarter as loud as a 50-watt amp. Doubling the output power of an amplifier results in a just noticeable increase in volume, so a 100-watt amplifier is only just noticeably louder than a 50-watt amplifier.
The 5MM power amplifier, introduced in 2019, is a similar pedal, with a reduced output of 2.5 watts, but with the ability to run on a common 9-volt power supply, as opposed to the 24-volt supply needed to power the 44 Magnum. 2016, Electro-Harmonix reissued the MIG-50 a 50 watt tube amplifier head and later the 2x12 speaker cabinet.
The Silver Jubilee series consisted of the 2555 (100 watt head), 2550 (50 watt head) along with other 255x model numbers denominating various combos and even a "short head". The Jubilee amplifiers were heavily based on the JCM800s of the time, featuring a very similar output section along with a new preamplifier.
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).