No hum/noise in my system with these, unlike most other great tube amps I've owned. These amps are in very good condition without any visible or functional issues. Dark Extended Features beyond the base monoblocks, per the Rogue website, include. Hex Fred high speed diodes in power supply. Polypropylene bypass capacitors in power supply.Nude Vishay resistors in critical locations. Telefunken and RCA small signal tubes. Black anodized CNC machined aluminum chassis. Entirely designed and built in the USA. The item "Rogue Audio M-180 M180 DARK Monoblock Tube Amplifiers Stereophile A+ 180 200 wpc" is in sale since Monday, July 8, 2019. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps". The seller is "little_milton" and is located in Norfolk, Virginia. This item can be shipped to United States.