Kevtris tears down the Tektronix PS2521G power supply. He produced this post detailing his findings.:
Weellll, I needed a good bench power supply, so I finally broke down and bought one. I got a Tektronix PS2521G. This doodad has three isolated outputs. This means that each of the three outputs can be wired in series or parallel with the others, and can float above ground or the other supplies. There’s two identical 0-20V at 0-2.5A outputs and a single 0-6V at 0-5A. Giving this supply a total of 130W it can output if all the outputs are going full bore.
Someone needs to publish the schematics. :)