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

Function of the card:
Free Running Crystal Oscillator (360KC)
Alloy-Oscillator 360KC Free Running (Crystal)

Listed in 1401 SMS card usage

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

Part number: 371405

Used in: IBM 1401, 7030, IBM 7090


IBM SMS card type FT 371405 IBM SMS card type FT 371405

References: Coslet data
IBM Standard Modular System, Component Circuits, pp216,217
2_2 SMS Cards, pp15,16
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, 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.