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TRANSISTOR
MUSEUM™ Historic Transistor Photo
Gallery Photo Essay – Shockley 4
Layer Diodes |
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Samples of 1950s Shockley Diodes from the Palo Alto Shockley Plant |
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Photo
Essay Commentary These
Shockley diodes have been recently donated to the Transistor Museum by
Ludwell Sibley. Here are some related
comments by Mr. Sibley: “These are literally floor sweepings. They were gathered
by a high-school buddy who had a part-time job as night janitor in the Shockley
plant in Palo Alto. I believe it was
the main facility on Page Mill Road; I think there was another building some
distance away. These (diodes), on being tested, turned out to be almost all
rejects. A bad PNPN acts as a mediocre
zener diode. A few diodes turned out
to work.” The
two leftmost diodes are labeled – the metal unit is a 4N120D and the glass
unit is a 4E20D. Shockley also made a
stud mounted diode, but none were included in this lot. The 4G200D shown earlier in this
PhotoEssay is an example of a stud mounted device. Go
To PhotoGallery Shockley Diodes Page 7 |
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Copyright © 2005 by Jack Ward. All Rights Reserved. http://www.transistormuseum.com/ PAGE 6 |
