Mk1 that was sent to Roger and updated to MkII. He also installed additional chokes and power supply capacitors. Two output tube fuse holders were added to the top plate to make them more easily accessible. Also, binding posts and input jacks were updated to Cardas. You will also notice the pigtail that allows you to use the power cord of your choice. The driver tubes were replaced with this service and I also had Roger put in a new set of Siemens EL-34 output tubes, matched quads($1000). The plinth shows it's age, but I have a new one that I can send to the buyer. The amp will ship from Roger's workshop in San Rafael and the plinth(free of charge) from my house in Vegas. Really awesome high powered tube amp (125watts/ch) that would be tough to beat anywhere near this price. I have been using the 35 watt RM-10 which is more than enough for my 98db speakers, so this amp needs a home.