John Frusciante used a Vox AC30 amp on the song “Porcelain” from the Red Hot Chili Peppers’ 1999 album Californication (Total Guitar (UK), Autumn 1999). A similar model, though likely not the exact same amp, was also seen during some of John’s performances with Ataxia around 2004.
Usually, the blonde Vox AC amps (like the AC15 in this picture) are the hand-wired version rather than the standard versions. Not sure if there’s any major tonal differences since I’ve never owned one, but a cool note still.