Output transformers (OPT's) serve a critical purpose in tube amplifier circuits. To function properly, their primary winding must match the impedance of the output tube(s) while the secondary winding must match the speaker impedance. By determining the Impedance Ratio of an OPT, we can quickly determine its suitability for use with any combination of output tube and speaker impedance......using math so simple it can be done mentally.
This video will explain how to quickly determine the Impedance Ratio of any OPT, even if it is unmarked and has no available specification data. Then it will demonstrate how the Impedance Ratio can be utilized to quickly determine which output tubes and speaker combinations the OPT can be used with. It will also show how to determine the impedance for all output tube(s) using readily available data.
In addition, we will get an update on the 1930 Ford ratrod and the furry musical trio: Jack, Ollie, and KC.
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