Jimi Hendrix, Eric Clapton, and other blues rock-based bands from the late 1960s such as Free used Marshall stacks both in the studio and live on stage making them among the most sought after and most popular amplifiers in the industry. This new amplifier, tentatively called the "Mark II", was eventually named the " JTM 45", after Jim and his son Terry Marshall and the maximum wattage of the amplifier. These circuit changes gave the amp more gain so that it broke into overdrive sooner on the volume control than the Bassman, and boosted the treble frequencies. Other crucial differences included the use of higher-gain ECC83 valves throughout the preamplifier, and the introduction of a capacitor/resistor filter after the volume control. For their Bassman, Fender used four ten-inch Jensen speakers in the same cabinet as the amplifier, but Marshall chose to separate the amplifier from the speakers, and placed four 12-inch Celestion speakers in a separate closed-back cabinet instead of Fender's four 10-inch Jensens in an open-back combo. Few speakers then were able to handle more than 15 watts, which meant that an amplifier approaching 50 watts had to use multiple speakers to handle the power. They were almost copies of the Bassman circuit, with American military-surplus 5881 power valves, a relative of the 6L6. The first six production units were assembled in the garden sheds of Bran, Craven, and Underwood in the same year, in Heston, Hanwell and Hayes, all in West London. As of Dudley's death in 1998 and Bran's death in 2018, the only original individual is Ken Underwood. The original idea was talked about late one Friday night in early 1963 in a Wimpy bar in Ealing in West London by three amateur radio enthusiasts after they had been to their weekly Greenford radio club meeting, Dudley Craven's call sign was G3PUN, Ken Bran's was G3UDC, and Ken Underwood's was G3SDW. As business increased, Marshall asked the three to work for him in his shop, as he had more space and capital to expand. The sixth prototype produced, in Marshall's words, the "Marshall Sound", although at this time the only involvement Marshall had was to sell the amplifiers on a commission basis in his shop. They most liked the sound of the 4×10-inch Fender Bassman and made several prototypes using the Fender Bassman amplifier as a model. Jim Marshall wanted someone to produce a cheaper alternative to American-made guitar amplifiers, but as he had limited electrical-engineering experience he enlisted the help of his shop repairman, Ken Bran, a Pan American Airways technician and Dudley Craven, an EMI apprentice. Marshall also manufactures less expensive solid-state, hybrid (vacuum tube and solid state) and modelling amplifiers.
Many of the current and reissue Marshall guitar amplifiers continue to use valves, as is common in this market sector. After gaining a lot of publicity, Marshall guitar amplifiers and loudspeaker cabinets were sought by guitarists for this new sound and increased volume. Their signature sound, characterized by sizzling distortion and "crunch," was conceived by Marshall after guitarists, such as Pete Townshend, visited Marshall's drum shop complaining that the guitar amplifiers then on the market didn't have the right sound or enough volume. Marshall's guitar amplifiers are among the most recognised in the world. It was founded by drum shop owner and drummer Jim Marshall, and is now based in Bletchley, Milton Keynes, Buckinghamshire. Marshall Amplification is a British company that designs and manufactures music amplifiers, speaker cabinets, brands personal headphones and earphones, a record label and, having acquired Natal Drums, drums and bongos.
This setup belonged to Jeff Hanneman of Slayer. A 3 × 6 stack of Marshall ModeFour guitar cabinets on the main stage of Tuska Open Air Metal Festival in 2008.
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