Re: Transformer winding article.
Yes, coupling by transformer is elegant, and has big benefits.
You can go single-ended to push-pull.
You have just one component (the transformer) in place of three (load resistor, capacitor, grid-leak resistor).
Problems with 'that' capacitor all go away.
A slightly gassy valve is not an issue, because the DC grid resistance is much lower (kΩ rather than approaching MΩ).
You can break ground loops because the secondary output is fully floating.
If it wasn't a matter of having to design and make them, they'd be brilliant!
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