ES-400 ANALOG COMPUTER SEARCH (THE BIG ONE)

[Chuck WA7ZZE]

Neil,

You may be thinking of the EC-1, another Heath analog computer that was (relatively speaking) fairly common. It was a box the same size as the TX-1, RX-1, et al.

The ES-400 is a much larger device with a broad, sloping front panel, and two or three rows of vacuum tubes on the top. See attached photo.

Along with the O-1 scope, this is a product I have never seen -- and I've been looking a long time.

Chuck / WA7ZZE



--- Neil Morrison <neilsmorr at HOTMAIL.COM> wrote:

I've seen 5 or 6 sold on eBay over the last couple of years, usually
around $500.

Neil

----- Original Message -----
From: "David Monroe" <dmonroe at PHOTOT.COM>


> Does anybody know the whereabouts of any Heathkit ES-400 Analog
Computers?
> (I have also heard them referred to as the H-1.)   Every
significant
> university had at least one of these beauties in the 1960's and
1970's.
> Where are they now?
>
> I would really appreciate knowing of any.

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