Fully functional, no issues. Great desktop amp with upgraded tubes. Includes vintage Telefunken EL84s and ITT tube. $100+ just in upgraded tubes. Sounds great, just not seeing much use lately. Some of the text is slightly rubbed off on main unit (see pictures). This is the unit that includes the separate power supply. OTL and transformer switch, so basically functions as two amps in one. $425 $415 $395 shipped (it’s fairly heavy, so that’s factoring into pricing)