Function of the card:
CTRL Emitter Follower NPN
Ctrl-emitter follower npn
Listed in 1401 SMS card usage
Complemented Transistor Resistor Logic (CTRL) is IBM's term for a form of resistor-transistor logic.
Part number: 371033
Used in: 7030, IBM 1410, IBM 729II, IBM 7090
Cap code: YA (details)
Symbol: DE
DE: Driver Emitter Follower. A driver, operating on the emitter follower principle, used for power amplification, impedance matching, and isolation without inversion. Often used as a logical element.
IBM Standard Modular System, Component Circuits, pp214,215
SMS Cap Code Templates & Index
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.