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

Function of the card:
Alloy-Current Source #2
Alloy current source

Germanium alloy transistors were an early type of transistor, faster than the earlier grown-junction transistors.

Part number: 370835

Field replacement part number: 370835

Customer Eng reference number: 729811

PCB number: 493173,747983

Used in: IBM 1401

Symbol:DP

DP: Driver, Power. A power driver used to drive Into multiple bases.
IBM SMS card type AQW 370835 IBM SMS card type AQW 370835 IBM SMS card type AQW 370835 IBM SMS card type AQW 370835 IBM SMS card type AQW 370835 IBM SMS card type AQW 370835

Image courtesy of Henk Stegeman

References:
1_2 SMS Cards, p70,71.
This page created by Ken Shirriff.

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.