The Marshall JTM45 is the first guitar amplifier made by Marshall. First produced in 1963, it has been called a "seminal" amplifier, and is praised as being among the most desirable of all the company's amplifiers. Prototyping of the JTM45 begin in 1962, after London musical instrument retailer Jim Marshall decided to create a new amplifier in response to local guitarists' desire for an alternative to Fender amps. Marshall first enlisted his shop repairman Ken Bran, who then recommended electronics "whiz kid" Dudley Craven as the chief circuit designer. Marshall had Pete Townshend and Ritchie Blackmore demo prototypes built by Bran and Craven, settling on the sixth prototype as the production model. Dubbed the "JTM45" - for Jim and his son Terry Marshall, and 45 for the RMS-rated wattage - the amp mimicked the circuitry of the Fender Bassman but used an all-aluminum chassis, a 12AX7 valve as the first in the chain (the Bassman has a 12AY7), Celestion speakers with a closed cabinet (compared to open-backed Jensen speakers), and a modified negative feedback circuit, which affects the harmonics produced by the amplifier. As Bran later said, "The JTM also had different harmonic content, and this was due to the large amount of feedback that Dudley Craven had given it." Early versions used 6L6 or US 5881 valves (a version of the 6L6) in the output stage; later models used KT66 (from 1964), EL34 (from 1966), or KT88 (from 1967; in the 200W Major), and ECC83 (12AX7) valves in the pre-amplification stage. The amp was also available as a bass (which lacked a "bright" capacitor) and a PA version (which lacked a "mixer" capacitor). Because of its power, Marshall decided early on to build it as a "head," with a separate 4×12" cabinet with Celestion speakers. More information...
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