how fast were drum memories?

Al Kossow aek at
Thu May 10 14:01:58 CDT 2018

On 5/10/18 10:37 AM, Al Kossow via cctalk wrote:
> On 5/10/18 9:29 AM, Paul Koning via cctalk wrote:
>> One that comes to mind is the DEC RS04.  It spins at roughly 3600 rpm (a hair less, so obviously a 2 pole induction motor running off 3-phase 60 Hz power).
> Vermont Research drums (model 1175B) spun at 3450 rpm 3ph 220v, The HP 2773 on the 2000A TSB was from VR so I expect RPM
> would be similar for most drums of similar diameter.

Just checked, and the LGP-30 and RPC-4000 drums are both listed as 3600 rpm

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