Bill I don't think the more expensive one is a Switchmode model.
I have that one and from memory it's not SMode.
It's very well built and I'm very happy with it.
The cheaper one (black) is a SMode and I was told it's not as good a quality as the more expensive unit.
I could be wrong (it's been a few years ago now) but I took their advice and went for the white unit.
RB
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