On 2022-Jan-06, at 12:19 AM, Joshua Rice via cctech wrote:
Not cost effective at nearly $10,000! I understand
they're very rare, given they were only used for a few years in industry and
they're clocking on 3/4 of a century old, but even then, that seems an order of
magnitude or two off the real value.
Actually, looking them up, doesn't seem they were used in much at all. Seems to have
been a bit of a technological dead-end since core memory quickly superseded it with
it's (relatively) cheap costs and (relative) ease of manufacturing. I imagine the US
gov. probably used them somewhere, since they were a sucker for cutting edge technology of
the time.
Would be interesting to know how many hours it's got on it
"Not cost effective" ? What does that mean in the arena of valuation of
historic artifacts?
No, they didn't go anywhere as a product and apparently only saw use in one machine.
However, the 'pro' side of such a debate is that they were a very early attempt to
produce a fast digital RAM memory specifically for use in Stored-Program Machines, at a
time when memory was at the top of the list of problems in development of the first SPMs,
and actually before any SPMs had been produced, and weren't a serial technology like
drums and delays lines tortured into applicability for the task.
They are wrapped up in the history of John VonN and the IAS machine, one of the most
significant machines in computing history (arguably the most significant).
There's always opinion and subjective valuation in assessments of history but if one
is acquainted with what was going on in that period of 46-50, they are a very interesting
and notable development attempt.
------ Original Message ------
From: "pbirkel--- via cctalk" <cctalk at classiccmp.org>
To: "'General Discussion: On-Topic Posts'" <cctech at
classiccmp.org>
Sent: Wednesday, 5 Jan, 2022 At 17:35
Subject: Memory Tech you don't see very often
Selectron Vacuum Tube:
https://www.ebay.com/itm/174977901251
<https://www.ebay.com/itm/174977901251>
Really nice photo-shoot! I wonder what the back-story to this particular
tube might be.
I don't think that $16.18 shipping would be, um, adequate protection by any
measure.
Cheap, but not so sure about "cost-effective" .