Here’s a great old documentary about tubes, filmed at the Mullard plant in Blackburn.
Before & After: a late 1950s Fender 5F4 Super-Amp
1966 Fender Telecaster
Godin Montreal with LR Baggs saddle transducers in addition to traditional humbuckers - amazing tonal variety
1957 Gibson ES-125
1958 Gibson ES-335
Early 1950s Gibson GA-50 amplifier