KBK update for Wednesday, 14th August

Series 7 is not Series 7 after all.

With the help of the fantastic staff at the Smithsonian Libraries (Christine and Trina), we have traced the reed switches to Series KB. For purposes of maximum historical confusion, these switches have an alphabetic series name but part numbers as though the series name was numeric.

By the 1973 Manual Switches catalogue, details on the keyboard switches were very cursory, likely because in keyboard applications they were long superseded by SW Series keyboards and switches.

As for SW Series, one of the last remaining anomalies is 1SW12-BL, which has been M demonstrated to be tactile. That must be what “BL” denotes. Sadly this is not in any of the recovered 1SW Series charts.

View within the updates for 2019

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