1950 RCA Advertisement, SELECTRON MEMORY TUBE, Early Computer Memory Tube
Item History & Price
| Reference Number: Avaluer:16214311 | Type of Advertising: Print Ad |
| Original/Reproduction: Original | Modified Item: No |
| Date of Origin: 1950 | Country/Region of Manufacture: United States |
Selling is an advertisement page for: RCA from 1950 This advertising page was by RCA, the Radio Corporation of America. The ad has a painting of an RCA tube. It is the Selectron tube, an early computer memory device. Quoting Wikipedia “Development of Selectron started in 1946 at the behest of John von Neumann of the Institute for Advanced Study, who was in the midst of designing the IAS machine and was looking for a new form of high-speed memory. RCA responded with t...he Selectron with a capacity of 4096 bits, with a planned production of 200 by the end of the year. They found the device to be much more difficult to build than expected, and they were still not available by the middle of 1948. As development dragged on the IAS machine was forced to switch to Williams tubes for storage, and the primary customer for Selectron disappeared. RCA continued work on the concept, re-designing it for a smaller 256-bit capacity. The 256-bit Selectron was projected to cost about $500 each when in full production. While they were more reliable and faster than the Williams tube, that cost and the lack of availability, meant they were used only in one computer: the RAND Corporation's JOHNNIAC. Both the Selectron and the Williams tube were superseded in the market by the more compact and cost effective magnetic core memory, in the early 1950s" Ad text starts “Tube with a memory keeps answers on file” and goes on about the tube and many possible uses. This ad is full page, approx. 7” x 10”, carefully removed from an actual 1950 magazine. This one is a little rough on the right edge where the magazine was stapled. my ad#50B1s Please note the flat-rate shipping for my advertising pages. This is one price for ANY NUMBER of ads, mailed flat (with cardstock stiffeners) in one envelope. If you are buying more than 1 ad (or multiple ad lot), don't pay until you have finished shopping. eBay should combine sales automatically. If they don't, please don't pay until I send the combined invoice.Click Here To Visit My eBay Store: busybeas books and ads
6000+ advertisement pages
non-fiction books
craft & hobby items
Anything I find that looks interesting!Please see my store for more goodies, books and magazines. I'll combine wins to save on postage.Thanks For Looking!Luke 12: 15 Note to CANADIAN purchasers: Since 2007 I've only been charging 5% GST on purchases. Thanks to a recent CRA audit I must change to the full GST/HST charge. Different provinces have different rates, though most are just 5%. My GST/HST number is 84416 2784 RT0001
6000+ advertisement pages
non-fiction books
craft & hobby items
Anything I find that looks interesting!Please see my store for more goodies, books and magazines. I'll combine wins to save on postage.Thanks For Looking!Luke 12: 15 Note to CANADIAN purchasers: Since 2007 I've only been charging 5% GST on purchases. Thanks to a recent CRA audit I must change to the full GST/HST charge. Different provinces have different rates, though most are just 5%. My GST/HST number is 84416 2784 RT0001
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