4406 entries. 94 themes. Last updated December 26, 2016.

IBM Phases Out Vacuum Tubes (1957)

In 1957 IBM phased out vacuum tubes in computer design:

“It shall be the policy of IBM to use solid-state circuitry in all machine developments. Furthermore, no new commercial machines or devices shall be announced which make primary use of tube circuitry.”

By this time IBM was satisfied with the reliability of transistors and convinced of the advantages of solid state over vacuum tube technology.