The TS100 rack-mount amp produces pristine clean tones via it's warm tube performance. It's equipped with 4 12AX7 and 4 EL34 output tubes. Internal bias selection switches are available for both channels. Front controls include power, stand by, volume and presense controls. 4, 8 & 16 ohm switching with bridge, parallel and ground lift switches. Premium built with steel chassis, chrome front panel and brass bushings for controls.