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This test circuit can be used to test the volt-time product supported by each of the mag amp coils.
Apply the square wave to the coil and observe the current wave form (voltage across the series resistor). Increase the applied voltage until a spike appears at the end of each half cycle, indicating core saturation. Saturation is defined as the point at which the magnitude of the spike has become twice the peak value of the square wave. (Actually, the current square wave is not flat but is gradually increasing due to the magnetizing current).
To record the volt-time product, simply multiply the applied peak voltage by the time required to reach saturation and divide by two.
The series resistor should be as small as possible, without loading the square wave supply. If the square wave generator is powerful enough, the differential amp may not be necessary.