This page describes the IBM SMS card "HB", and is part of the SMS card database.

Function of the card:
Cap Sense Amplifier – No Lds
Capacitor Sense Amplifier (no loads)

Listed in 1401 SMS card usage

Part number: 371561

Used in: IBM 1401, IBM 7070

Cap code: None (details)

Symbol: AM

AM: Amplifier. Provides increased strength to a detected signal or pulse.

References: IBM Standard Modular System, Component Circuits, p143
2_2 SMS Cards, p154
Coslet data

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.