Built by Standel and marketed by Gibson, these SG amps have a unique voice. The SG Systems SG212 is a 50 watt amp with 2X12 original Eminence speakers, 2 X 8417 tube power amp, and solid state preamp. It has dual channels, reverb, phase shifter, and master volume. Consignment. Sorry, we no longer ship used amps, in-store sales only. This amp is in very good+ condition.