The Type 942-A Transformer is designed primarily as a high-power output transformer for a push-pull amplifier, but is by no means limited to this specific use and may serve as a versatile 100-watt step-up or step-down transformer in a variety of applications. The advantages of the toroidal core transformer^ over one using a shell- type core are becoming more generally recognized. Chief among these are the high degree of astaticism and the extremely tight coupling that can be attained between windings extending around the complete circumference of the toroid. The Type 942-A Output Transformer combines excellent frequency response, low distortion, high power-handling capacity, and flexibility of impedance ratios in a convenient, compact unit. Leakage reactance between primary sections is very small, to give minimum distortion from switching transients in conventional push-pull amplifier circuits. Connections to individual primaries are provided for use in the single-ended push-pull amplifier described in Section 7. The Type 942-A Output Transformer uses the same high-quality toroidal core that is used in the Type V-5 Variacs, and can handle peak powers up to up to 100 watts with a minimum of harmonic distortion.