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

Function of the card:
Alloy-Oscillator 347.5KC Free Running (Crystal)
Free Running Crystal Oscillator (363.4KC)
Alloy osc 347.5kc free run crystal

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

Part number:371788

Field replacement part number:371788

Customer Eng reference number:729895

Used in:IBM 1401

Symbol:OSC

OSC: Oscillator. A free-running non-stable muitivibrator used to provide pulses of a given frequency and amplitude.

References:
IBM Standard Modular System, Component Circuits, p216,217.
2_2 SMS Cards, p58,59.
This page created by Ken Shirriff, 2015.

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. Images courtesy of Randall Neff. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.

Creation time: Tue Mar 03 23:40:34 2015.