Atma-Sphere S-30 Rev3 Tube OTL Amplifier30WRMS x 2 output power at 8 ohm. Very good condition, low hour, never serviced, one of best sounding tube amp see review at Atma-Sphere website.All tube are original.Input RCA and XLR. For RCA input needs a jumper at XLR input (not includes) Input voltage is 220-240V but mains transformers can be configured to accept 110-120V (can be done by Ralph/Atma-Sphere)