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The second prototype reportedly used two output transformers, two GZ34 rectifiers, and four 6L6 output tubes, whereas the third prototype used KT66 output tubes.Ken Bran and Dudley Craven at Marshall eventually dropped the GZ34 tube rectifier, increasing power and reliability. Their first amps were very heavily "inspired" on the 1959 Fender Tweed 4x10" Bassman. In the brochures they were called Artist, but the panels on the amps show Artiste. The head amp was also available seperately as model 2048. The schematic is the same as that for the 2040 Artiste amp.
The first 100 watt amps known today as JTM45/100s used JTM45 plexi faceplates and white Super 100 Amplifier back-plates. The main stages in the evolution of these early 100 watt amps are Whos Pete Townsend.He said the rival Fender amp, tremendously popular at the time, produced an extremely clean sound that worked well with jazz and country and western but did not satisfy younger players searching for something different. Marshall was a larger than life figure with a taste for single malt Scotch whiskey and Cuban Montecristo cigars.Even in his 70s, when he was already suffering from some serious health problems, he thought nothing of hopping a plane to catch an Iron Maiden concert. The Marshall trademark was established circa 1962 in Hanwell, England.Because of tuberculosis, he wasn't able to go into the forces for World War II. He was able to explore his interest in engineering and electronics and used this engineering experience by working at Heston Aircraft in Middlesex as a tool maker in the late '40s.
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The speaker cabinets were closed 4x12" Celestion loaded cabinets. It isn't clear if these amps were actually part of the JCM800 series.