A radio frequency system comprising: a first power splitter configured to receive a first radio frequency signal and generate a first output signal and a second output signal; a first push-pull power amplifier configured to amplify the first output signal, wherein the first push-pull power amplifier comprises a first input transformer, a first set of transistors (Q1, Q2) including at least two radio frequency power transistors and a first output transformer, wherein the first output signal is provided to a primary winding of the input transformer and each of two outputs of the secondary winding of the first input transformer is connected to an input of a respective one of the first set of transistors (Q1, Q2); and a second push-pull power amplifier configured to amplify the second output signal, wherein the second push-pull power amplifier comprises a second input transformer, a second set of transistors (Q3, Q4) including at least two radio frequency power transistors and a second output transformer, wherein the second output signal is provided to a primary winding of the second input transformer and each of two outputs of the secondary winding of the second input transformer is connected to an input of a respective one of the second set of transistors (Q3, Q4); wherein each of two inputs of the primary winding of the first output transformer is connected to an output of a respective one of the first set of transistors (Q1,Q2);wherein each of two inputs of the primary winding of the second output transformer is connected to an output of a respective one of the second set of transistors (Q3,Q4); wherein the outputs of the first and second output transformers (T5, T6) are combined directly via respective transmission lines (231, 232) at an output terminal of the radio frequency system. a first power splitter configured to receive a first radio frequency signal and generate a first output signal and a second output signal; a first push-pull power amplifier configured to amplify the first output signal, wherein the first push-pull power amplifier comprises a first input transformer, a first set of transistors (Q1, Q2) including at least two radio frequency power transistors and a first output transformer, wherein the first output signal is provided to a primary winding of the input transformer and each of two outputs of the secondary winding of the first input transformer is connected to an input of a respective one of the first set of transistors (Q1, Q2); and a second push-pull power amplifier configured to amplify the second output signal, wherein the second push-pull power amplifier comprises a second input transformer, a second set of transistors (Q3, Q4) including at least two radio frequency power transistors and a second output transformer, wherein the second output signal is provided to a primary winding of the second input transformer and each of two outputs of the secondary winding of the second input transformer is connected to an input of a respective one of the second set of transistors (Q3, Q4); wherein each of two inputs of the primary winding of the first output transformer is connected to an output of a respective one of the first set of transistors (Q1,Q2);wherein each of two inputs of the primary winding of the second output transformer is connected to an output of a respective one of the second set of transistors (Q3,Q4); wherein the outputs of the first and second output transformers (T5, T6) are combined directly via respective transmission lines (231, 232) at an output terminal of the radio frequency system.