Williams Tube memory, Selectron question, and Charactron

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Sun Aug 15 21:03:47 1999

At 07:45 AM 8/15/99 -0000, Eric wrote:

>Does anyone know how RCA's Selectron memory tube worked? I've seen pictures
>but no explanation.
It was an electrostatic memory tube with 256 bits as 2 16x8 arrays, one on
each side of the cathode. X-Y grid wires could be addressed to form a beam
(4 +potential wires, 2 X and 2 Y formed a window/electron lens). Beyond
were electrically isolated targets. These, by biases to other electrodes,
could be charged to 2 different potentials (170V) by the beam. The targets
were shaped like eyelets so at the more negative potential, the read beam
would be repelled, and at the positive potential, the beam would pass
through to a faraday cage and anode where it was read out.
There also was a fluorescent screen, maybe for visual readout or maybe for
secondary emission amplification?
ps, Cool idea Allison on a vacuum f. triode flip-flop/ readout.
Received on Sun Aug 15 1999 - 21:03:47 BST

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