George A. Philbrick Researches, Inc.

George A. Philbrick Researches, Inc. was founded in 1946 by George Philbrick in Boston, MA to build analog computers for military aircraft. The vacuum tube-based K2-W, the first commercial general-purpose differential op amp, introduced in 1952 led to a broad line of transistorized analog modules. Philbrick was acquired together with its spin-out company Nexus by Teledyne in 1966.