A Ferractor amplifier
is a type of magnetic amplifier
circuit built with Ferractors
(a type of transformer wound on a saturable core having a nearly rectangular hysteresis
loop with two stable states). UNIVAC
used them in the logic circuits of some of their computers in the late 1950s and early 1960s instead of vacuum tube
or transistor electronic
- Ferractor was a registered trademark of Sperry Rand Corporation.