From what I have heard it is just the way the watts were rated, differant years differant watt ratings, basically an oddity. I like the post war ZW's better than the modern ones as everything is inside one unit, don't have to add anything to the transformer.
Lee F.
I am a person with a very active inner child. This is why my wife loves me so. Willoughby, Ohio - the home of the CP & E RR. OTTS Founder www.spankybird.shutterfly.com
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