Blues Harp Amps 12: 1959 Masco A-18 A18 18 Audiosphere - Video
PUBLISHED: Oct 27, 2011
DESCRIPTION: Blues Harp Amp. Masco A-18 A18. Nice clean trombone-like honk down at the bottom end. Mostly down to the fabulous speakers, however the Masco is also a seriously powerful harp amp. I swapped the 12AX7 for a 6SL7.
Update: Further research indicates that this is the mother of all harp rigs.