Vox AC30 head
Matt Bellamy's favorite recording amp are the vintage Vox AC30s from 1964 and 1970. The '64 in particular because of the extreme spike of its Top Boost. Instead of using the old 'fragile and too high maintenance' vintage AC30s on tour, Bellamy switches them out for newer AC30s. Bellamy uses the AC30 for his core sound and then mixes in his other amps to mix things up around it.