Dared MP-2A3C Tube SET Integrated Amplifier It uses 2A3C tubes for true SET (single-end triode). Gold PCB and Gold tube sockets, pure silver signal wires Allen Bradley NOS key resistors, audiophile grate coupling caps EM80/6E2 (or EM87) green cat's-eye tube (tube metering). US version MP-2A3C uses 12AX7 and 12AU7 tubes (auto-biased)