Servo amplifier (T460E)

This circuit was found in a 1948 MIT publication. It uses two double triodes and has a high voltage supply. A 28V servo motor is used.

SN74LVC1G79 and SN74LVC1G179-Q1 Type D Flip Flop from Texas Instruments
Texas Instruments Type D flipflops N74LVC1G79 and SN74LVC1G179-Q1 for operation from 1.65 to 5.5V...
Current Booster (CB4901E)
We found this circuit in an old American operational Amp. documentation. The circuit applies to...
Precision Phase Shift (CB5440E)
We find this circuit in a 1980s documentation. The integrated ones are of the time and their...