Tube chart · Guitar amp
Tubes for Marshall Super Lead Plexi (1959)
Era: 1965–1969 (plexi panel)Power: 100 W
The 1959 Super Lead is the Mount Rushmore guitar amp — Page, Hendrix, Townshend, Iommi. 4× EL34 in fixed bias, solid-state rectifier, no master volume. The plexi tone lives in pushing the power tubes hard into saturation; quartets of NOS Mullard XF2 EL34s remain the most-rolled choice when chasing the original sound.
Complete tube line-up
Every socket in the Super Lead Plexi (1959), with stock tubes, direct-swap alternatives, and rolling notes. Tube names link to dedicated specification pages.
Important: bias before you swap
Power tube swaps almost always require rebiasing — running a new quartet of EL34 cold or hot will shorten tube life dramatically and can damage the output transformer. See the biasing guide and the troubleshooting guide before rolling tubes.