Early Tube Amp Development
Fender introduced its first production amplifiers in the late 1940s, with the Tweed-covered 5F series emerging in the mid-1950s as compact combos delivering 10 to 40 watts through 10- or 12-inch speakers. Vox followed in 1958 with the AC15 and later the AC30, using EL84 tubes to create the chimey, mid-forward British tone heard on countless 1960s recordings.
Marshall and the Plexi Era
Marshall began building amps in 1962, cloning the Fender 5F6-A Bassman circuit before releasing the JTM45 and subsequent Plexi models in 1965-1969. These 50- and 100-watt heads paired with 4x12 cabinets became the backbone of hard rock, with artists such as Pete Townshend and Jimmy Page driving them into natural distortion at high volumes.
Decline and Collectibility
By the mid-1970s, manufacturers shifted to master-volume designs and solid-state options, ending the hand-wired, point-to-point era. Original vintage examples survived in limited numbers, leading to strong collector demand for unmodified specimens with original transformers and tubes.
