Marshall Major
The Marshall Major was a bass guitar amplifier made by Marshall. It was introduced in 1967 as the "Marshall 200". It had a plexiglass panel and two inputs in one channel, but in contrast with the 100 watt heads made by Marshall, the first series had split tone controls. For the second series, in late 1968, Marshall reverted to ordinary passive tone controls, and was called the "Marshall Major".
The amplifier used KT88 output valves, two ECC83 preamp valves and one ECC82 valve as a phase inverter. Approximately 1,200 of these amps were produced from 1967 to 1974; Marshall ceased production when the supply of KT88s ran out.
The amplifier was used by rock musicians who needed very high volume. A notable user is Ritchie Blackmore; his Major had the two input channels cascaded into one, essentially creating the first Marshall with a master volume.