Source
Marshall 1959 Handwired head official page
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Marshall 1959 Super Lead
Amplifier · United Kingdom
The 1959 Super Lead, nicknamed the 'Plexi' for its early acrylic front panel, is Marshall's 100-watt non-master-volume all-valve head first built in the mid-1960s. With EL34 power valves and no master volume, it is bright, extremely loud, and overdrives only when pushed hard, making it the archetypal British rock stack head.