TRANSISTOR MUSEUM � Historic Transistor Photo Gallery� �
� � � � � Transistor Size (1/8� OD X 3/8�) Standard T0-24 Case No Date Code � � �	� PHILCO A01 � TYPE Germanium PNP Surface Barrier RF/IF/OSC � USAGE Hobbyist� � DATE INTRODUCED Mid 1950s � CASE STYLES Silver Metal (Later) � AVAILABILITY Common (High Volume Production) �
� HISTORIC NOTES Philco was a major germanium transistor manufacturer in the 1950s, and was the industry leader the area of high frequency radio and computer transistors � this leadership was based on the famous surface barrier transistor technology developed by Philco in the early 1950s.� A variety of surface barrier transistors were manufactured by Philco, including the 2N128, 2N501, SB100, SB101 and SB102. The A01 was a surface barrier device and appears to be the product of a sales tactic used by Philco to market lower performing transistors to the hobbyist market. Likely the A01 was the label stamped on the case of any remaining transistors which wouldn�t pass either frequency or gain requirements for other SB types.� �The 1957 Lafayette Radio catalog lists the A01 for $1.90, which was the lowest price of all SB types sold.� �The A01 was used in a number of hobbyist projects and even made it into production radio � the unique two transistor Regency XR-2A earphone radio. � � �
Copyright � 2005 by Jack Ward http://www.transistormuseum.com �

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