Charting the evolution of solid-state and digital guitar amps – and the future of tubes

Roland Jazz Chorus
(Image credit: Future)

Wars typically speed up developments in technology, and one goal throughout WWII was to find a replacement for the bulky, energy-hungry, fragile glass electron valve, more commonly known as the vacuum tube. 

The first working transistor was demonstrated by Bell Telephone Labs in 1947 and publicly announced in June 1948. Initially available only to the military, the first domestic products were hearing aids. 

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Nick Guppy

Nick Guppy was Guitarist magazine's amp guru for over 20 years. He built his first valve amplifier at the age of 12 and bought, sold and restored many more, with a particular interest in Vox, Selmer, Orange and tweed-era Fenders, alongside Riveras and Mark Series Boogies. When wielding a guitar instead of soldering iron, he enjoyed a diverse musical career playing all over the UK, including occasional stints with theatre groups, orchestras and big bands as well as power trios and tributes. He passed away suddenly in April 2024, leaving a legacy of amplifier wisdom behind him.