It simply reflects the impedance load on the secondary back to the primary.Ī transformer has a turns ratio which can be measured by putting an small AC voltage across the primary and measuring the resulting secondary voltage. Reflected impedance An output transformer has no impedance by itself (ignoring primary inductance/resistance for the moment, which is a different subject). The main parameters are: (a) the reflected primary impedance for a given secondary load impedance, which must match the needs of the particular tube being used, (b) the primary inductance, which determines the low frequency response, (c) the primary leakage inductance and capacitance, which determines the high frequency response, (d) the power handling capability, which determines the necessary core size and wire size, and (e) the mechanical details, such as the mounting style (upright 'X' mount, laydown 'Z' mount, etc.), the lead color and length, the use of end bells, the finish, shielding, etc.
General There are several things that are important in getting an output transformer made.
