Chuck Guzis <cclist at sydex.com> wrote: And long after WWII! In the 1960s, I had a Motorola 140D (140 for the power, "D" standing for Dynamoter) mobile radio (6 meter ham band) in my car. Everytime I keyed the mike, the dynamoter would instantly spin up with a loud whine. Such radios were normally housed in the trunk of the car and required heavy wire to carry the 12 volt battery current for the dynamoter. My Monarch 10EE lathe originally came with a big motor-generator to power the variable-speed DC motor. Later versions use thyratrons, while even later ones were solid state, but they all continued to use DC motors. The variable-speed DC drive was very similar (identical?) to elevator drives, known as the Ward-Leonard system. To bring this back to the RK05, someone asked if anyone had a copy of the RK05 IPB. If you still need it, let me know and I'll dig it out. I haven't packed it for my move yet, but the drives are. Alan