Behringer Tube Ultragain MIC500USB PreampTUBE ULTRAGAIN MIC500USB Tubes can really warm up a signal fast, giving it depth and character. Though transistors have succeeded the technology, many musicians agree that tubes deliver a far superior sound. The TUBE ULTRAGAIN MIC500USBs handselected 12AX7 vacuum tube gives everything from microphones to acoustic or bass guitars that vintage tube vibe in a dependable and ultra affordable package. Put A Little Tube In Your Tone The MIC500USB is perfect