Historic Transistor Photo Gallery

Raytheon Blues - “Baby Blues”










Photo Essay Commentary

Many of the early “Blues” were small devices, as Raytheon began improving the technology for transistor encapsulation.  Shown above are examples of various small case styles, with a “standard” CK721 shown in the center for comparison.  The three leftmost units were all developed for hearing aid use, which was a primary market for Raytheon for many years, and which benefited from small size.  The CK782 is a “half-height” hearing aid transistor shown next to the more common CK785.  The CK726 is a fragile and elegant style, made for a very short time.  Only a few examples are known to exist, all retrieved from hearing aids.   The three rightmost units are general purpose transistors, all in small case styles.







Go To PhotoGallery Raytheon Blues  Page 4









Copyright © 2005 by Jack Ward. All Rights Reserved.