Build/mods include: 2mm stainless steel chassis (5mm front) over wood side & bottom, dual xfmrs offset and 4"+ from PCB (also separated by two grounded parallel shielding plates), Sonicap Platinum teflon caps, BlackGate N/NX caps, TKD 2P65S stepped attenuator (bypassed with Vishay S102 resistors), Vampire OFC RCA connectors, single source input (no source switch or balance control in signal path), damped PCB mountings, Dynamat Extreme damping compound on metal parts of chassis, dual outputs (one off tube stage for main amp, one off solid state stage for subwoofer), ...