Explore Neural Amp Modeler (NAM) profiles of the legendary Marshall JTM45, the amplifier that started it all. Born in 1962 as Marshall's first production model, this iconic 45-watt head delivered the foundation of British rock tone that defined generations. From the original JTM45 MkII with its GZ34 tube rectifier to the coveted "Bluesbreaker" sound immortalized by Eric Clapton on John Mayall's legendary album, these profiles capture the warm, dynamic breakup and rich harmonics that inspired Pete Townshend, Jimi Hendrix, and countless others. Experience the 2x KT66 power section's creamy overdrive and touch-sensitive response that became the blueprint for all Marshall amplifiers to follow.