Chuck Harris wrote:

A swinging choke aids in the *voltage* regulation of a choke input
power supply by having a high inductive reactance at low currents (where the
supply would tend to be too high in voltage), and having low inductive
reactance at high currents (where the supply would normally tend to droop.)

Is that what you are thinking of?

Ahh! So the increased current causes the inductive reactance to drop,
causing the series impedance to drop. That makes sense, so long as the
source impedance is the same all the time, right?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."