Motor generator

Jon Elson elson at
Wed May 5 11:19:19 CDT 2021

On 05/05/2021 10:36 AM, Chuck Guzis via cctalk wrote:
> As far as any "whine"--I vaguely recall hearing a 
> high-pitched whine if I put my ear close to the power 
> adjustment panel in a CDC Cyber--but it was barely audible.

The inverter whine on the 360/50 and /65 was completely 
insane, and the 2500 Hz output put the pulses from the 
push-pull SCRs at 5 KHz, near the ear's peak sensitivity.  
They had to lay out the machine room so nobody would have to 
be near it for more than a few seconds.  The tape library 
and CE work area was back behind the CPU.

But, it was not really audible near the console.


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