Function of the card:
Alloy-Difference Amplifier
Alloy difference amplifier
Alloy Difference Amplifier
Listed in 1401 SMS card usage
Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.
Part number: 371671
Used in: IBM 1401, IBM 1410, 7030, IBM 1414 I/O Synchronizer
Image courtesy of Henk Stegeman
2_2 SMS Cards, p49
Coslet data
National Museum of Computing.
This page created by Ken Shirriff on Wed Sep 15 18:15:10 2021.
The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.