How Using Dummy Load When Testing Can Affect Efficiency Of VR

OK, what kind of VR are you using?

What is your dummy load? Is it purely resistive or does it made with wire around some core? Is inductance part of the issue? (I guess that depends on the answer to the first question.)

Is your SAT test a saturation of a transformer?

You know, one of the reasons people won't answer some of these questions is because there is insufficient description of what you are talking about. We can't see what you are holding in your hand......(unless you insert it as a picture)