Audio Frequency Transformers

In the foregoing paper a method for calculating the amplification curve of an audio frequency transformer is developed in terms of the usual constants of the transformer and of the tube. The distributed capacity of the coils and the mutual capacity between the primary and secondary coils are represented by lumped capacities. The exciting current of the transformer is neglected. As the equation for the amplification in the vector form is rather involved as approximate formula is then developed and its limitations pointed our.