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RE: Hammond 125ESE bandwidth when used at lower power?

"I concluded that the 125ESE should work quite well with a 2A3 at 2500 ohms. The bass might be a little weak at 5Kohms, but not terrible."

I was wondering about, and trying to research this.
Without getting too far into it (unless you want to), are the following correct?
1. The secondary "taps" are all taps at different points on one physical wire.
2. If "1" is true, then using the taps for higher effective primary impedance increases leakage inductance and decreases mutual inductance. The best scenario is to use a transformer with a single secondary impedance, or to use the tap for its highest secondary impedance.

Thank you for being tolerant of my questions.

Adam

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