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Were metal-can transistor pin spacings originally based on tube pinouts?
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Alex Eisenhut:
Idly playing with my tube pin straightener, I was curious to see if I could use it on a 4-pin TO-3 package one pin at a time. Much to my surprise, it fit the 9-pin Noval socket on my pin straightener.

Weird. Ya think JEDEC still had some JETEC diagrams lying around and just reused them?
amyk:
http://www.interfacebus.com/semiconductor-transistor-packages-4-pin-TO-3-flange-mount.html

https://w140.com/tekwiki/images/0/06/B9A_base.gif

They are definitely almost exactly the same.
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