A new type of magnetic signal mixing amplifier is introduced which is useful for the treatment of multisignals biased with different levels of potential. A saturable core and transistors are its basic components. This mixing amplifier is excellent in linearity, has push-pull with an inherently single core, has a quick response, and is operated with a dc source. Decoupling of the input and output is made possible by use of the three-core configuration. An arrangement is also presented in which the isolation of the output from the dc source can be attained by the use of other windings.