The companies mentioned and their history since 1967:

Fairchild is still operational after a series of mergers and spin-offs.

Burroughs Corporation merged with Unisys in 1986.

Stromberg-Carlson, at the time owned by General Dynamics, was sold in parts in the following years.

H. H. Scott was eventually bought out by Emerson Electronics, but vintage, pre-IC Scott amplifiers are still popular with the audiophile crowd.