Historic Transistor Photo Gallery

Photo Essay – Bell Labs M1752 






Photo Courtesy Bob McGarrah


Photo Essay Commentary

Apparently some of the M1752 transistors were not labeled with either a color code or text, but were identified with a serial number on a paper strip attached to one of the leads.  The photos above show two such units, with paper label serial numbers “DE838 and DE684”.  (The top left photo provides a comparison of “DE838” with a color-coded M1752).  These unmarked units appear to be physically identical to the M1752s shown earlier.  The bottom photo is an extreme close-up of “DE838” and clearly illustrates the unrefined nature of the early junction transistor manufacturing processes.


Go To PhotoGallery M1752 Page4


Copyright © 2004 by Jack Ward. All Rights Reserved.