RA81 destruction

Simon Fryer fryers at gmail.com
Fri Nov 3 10:22:49 CST 2006

Hey All,

On 11/3/06, Jay West <jwest at classiccmp.org> wrote:

[RA81s with bad HDAs]

> Since I don't know anything about RA81's yet (have never used them or opened
> one up), and because I do intend to keep one or two of the drives running (a
> few don't say "bad hda" on them), can someone tell me what parts I should
> scavange off the dead ones that are worth keeping as spares? I know the
> obvious like the light bulbs and drive select plugs, but what about
> components on the inside that "those in the know" would advise I not just
> pitch with the drives?

I seem to remember, many moons ago, of a story where a couple of
physisists used the servo assemblies from the head actuators to make a
magnetically susported table. The table was automatically adjusted for
any vibration and to keep it level. I don't remember if they used the
head assembly servos from an RA81 or a different type of DEC drive.

Has anyone else heard of this story and can remember if it was RA81
drives or not?



"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh

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