Audio transformer windings are usually specified by impedance (in ohms). Take the square root of the ohms to get the turns ratio. Suppose you need an audio output transformer with a 3K ohm primary ...

Here’s a nostalgic vibe of an awesome analog chip from the 1990s era that’s still making an impact in audio designs.

Or you can bring out the big guns and power everything with a high-end isolation transformer. If a device like the $510 Tripplite IS1000HG can be trusted to protect and clean up the electricity ...