All-tube combo amplifier for electric guitar that is intended for the performing guitarist who needs a vintage sounding amp that gracefully handles the output from a complex pedal rig. It features a unique switchable rectifier topology, allowing musicians to select 35-Watts (Class A) or 45/60 watts (Class AB) to suit the gig at hand. The 35 watt cathode bias mode uses the legendary Thunderbolt power amp topology for a harmonically saturated, tube-rectified sound. The 45 and 60 watt grid bias modes provide more volume and headroom as well as the faster transient response associated with Class AB power amps. The topology also provides two very different, all-tube tremolo effects depending on whether Class A (cathode bias) or Class AB (grid bias) mode is selected: either a vintage Valco/Supro tremolo, where the overall depth of the effect changes along with the dynamics of the playing (Class A), or a tremolo that gives a much deeper, stronger and more pronounced throbbing effect (Class AB). Since the tremolo is performed by modulating the bias of the output tubes, the reverb necessarily comes before the tremolo effect, for a mesmerizing combination of pure tube reverb and tremolo when both effects are combined. The combo comes equipped with a state of the art, USA made HP12 speaker that was designed specifically for this model and combines the exceptional clarity and treble extension of the Supro DT12 speaker, with superior power handling due to a larger magnet and a hemp cone. This speaker’s distinctively smooth character remains sweet in all settings and delivers a full bodied woody tone. Dimensions: 600 x 410 x 270 mm. Weight: 24.5 kg.