[time-nuts] The home time-lab

Scott Stansbury sstansbury at aol.com
Tue Jul 26 10:53:59 EDT 2016

> On Jul 26, 2016, at 12:04 AM, jimlux <jimlux at earthlink.net> wrote:
> IBM mainframes used a similar scheme but I can't remember the details.

Yes. We had 3 3090 <https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3090.html>’s and they all incorporated multiple motor/generator units ( 3089 ) to generate 400Hz power ( in addition to chilled water distribution modules, etc. )

IBM 3089 Power Unit
The IBM 3089 is connected to your mainline supply. It is designed to provide a stabilized 400 Hertz AC power source to units of the Processor Complex

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