Measuring Tube Amplifier Output Transformer Impedance

Resistance vs Impedance, what does all this mean and how can you measure what an unknown output transformer is? How do we determine phasing? All these secrets are revealed, along with explaining the super simple math used to calculate what's happening.
I really do try to not get too deep into math and calculations but this is one area where it's a must. This topic was super confusing but I now understand and hope I am able to explain this simply, so you can too!
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