I'll be building the '62 Brit-Plex from Stewac. I've read through the instruction manual several times and read the reviews with notes from others who have built the kit. The kit and other items I ordered will arrive here Tuesday. My research shows that it is a clone of an early 1966 JTM45, after the change to EL34 valves, but before the change to a solid state rectifier. I'm looking forward to starting the project. It shouldn't take to long, at least in terms of total man-hours.