On 5/7/21 2:36 AM, Curious Marc via cctalk wrote: > The IBM 7090 used a motor generator, IBM model 7618 apparently > http://ed-thelen.org/comp-hist/7090-PowerSupplyControl&Distribution-223-6904.pdf
I mentioned that about a dozen posts back: The 7090 certainly used MG sets. From the "Power Supply and Distribution Manual" (http://bitsavers.org/pdf/ibm/7090/ce/7090%20Power%20Supply%20Control%20and%20Distribution%20223-6904.pdf, page 5): "The IBM 7608, a power converter or motor-generator set which converts incoming 60-cycle three-phase (3Ø), 208v power to regulated 400-cycle 3Ø 208v power."
