Collection of vintage vacuum tube devices, including: two "C.R.T. Register/Gate" units for analog computers with vacuum tube operational amplifier modules; a "Control / Vertical Sweep" unit for an analog computer with a vacuum tube operational amplifier module; six George A. Philbrick Researches K2 vacuum tube amplifiers; a USA-3 stabilized amplifier; a Type 53/54C Plug-In Unit Dual-Trace Calibrated Preamp; two large units with several vacuum tubes and Beckman op-amps; and an Engineered Electronics N-106 Transistor Decade unit. In overall very good to fine condition.
