The Supro Thunderbolt Plus amplifier adds switchable power-amp topology to the legendary 1964 Supro Thunderbolt, giving you the original 35-Watt Class A Cathode bias sound as well as beefy 45-Watt and 60-Watt Grid bias modes for additional headroom and tonal variation. This unique design is implemented via a three-way selector switch on the front panel.Normal and extra-hot input options, combined with a wide range of available gain on tap, allow you to fine-tune the texture and response of this amps massive sound. Turned all the way up, the Thunderbolt exhibits nearly zero self-noise, yet it puts out enough volume to be easily heard on large venue and theatre stages, with overdrive completely controlled by the guitars volume knob. The 35-Watt and 45-Watt modes both deliver the sag and bluster of the 5U4 tube rectifier while the 60-Watt mode uses a silicon rectifier to unleash maximum Thunderbolt power. The 60-Watt modes faster transient response and ample headroom is wonderful for pedals, and brings the Supro sound loud and clear to any size venue.Massive custom transformers and lightweight, vintage-correct cabinetrycombined with the best sounding 15 guitar speaker money can buyput the Thunderbolt in a class of its own. With the amp turned all the way up, chords ring with exceptional clarity and definition amidst copious amounts of tube overdrive and output-stage saturation. The variable power switching found in the Thunderbolt Plus model is an over-the-top hot-rod custom luxury guitar experience.Power: 35 watts (Class A, with tube rectifier); 45 watts (Class AB with tube rectifier); 60 watts (Class AB with silicon rectifier)Tubes: two 12AX7; two 6L6; one 5U4Single channelTwo inputsSpeaker: 1×15 Supro TB15Controls: tone, volume, 3-way power-amp switching knobBlue Rhino Hide tolexDimensions: 23.6 in. x 19 in. x 10.5 in.Weight: 45 lbs.Assembled in the U.S.A. Amplifiers & Effects, Amplifiers, Guitar Amplifiers, Combo Guitar Amplifiers, Tube Combo Guitar Amplifiers Supro J27785M.001 USED005001 S6420PLUS-U Supro, Tube Combo Guitar Amplifiers |