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

Function of the card:
Alloy-amplifier, pre sense no. 2
Alloy-Amplifier, Pre Sense No. 2

Gated Open Collector Sense Amplifier

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

Part number: 371900

PCB number: 493199

Used in: IBM 1620

Symbol:AMP

Pinout:

A I1+
B
C I1-
D
E
F O1
G
H *I1
J GND
K
L
M -12V
N
P
Q +12V
R
References: Coslet data
IBM 1620 Instructional System Diagrams, p497

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.