The Harmony Model H420 is loud, gutsy and gritty, with mild but nice distortion. This amp head version is “custom made” the guts of the Harmony H420 using the housing from an old Fender amp head. It has one Dumont ERP 73-22 171A, one GE 6L6 GC, one GE 12AX7A and one RCA 12AXA7 america made tubes. It operates at 117 volts AC 60 Hz with 15 amps of powers. This “head” version needs a 3 Amp Fuse and is currently not working. Owned and used by the famous Indigo Ranch Studios, Sonic Circus now has the privilege to sell this one of a kind amplifier.