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How are you going to test it? If it runs your trains it is good enough huh? Try this; the full load to no load regulation is important and so is the ripple. If you like do these two tests and get back to this column and I might be able to cast some light on their quality as power supplies. 1) measure the voltage with no load on it, ie with the power on, it connected to the rails with no locos on it. The current should be zero and the voltage up near 20 V. Then load it up with every unit you have, every electrical load possible, locos lights anything. Then measure the voltage and the current if you can. This will give you and idea of how good its regulation is and this is impportant. 2) Put your metre on 20 V AC (AC not DC) and note the reading that you get; this will tell you what the ripple is. Ripple is the AC component of a direct current. Both of these things will affect the long term life of your equipment. Rgds Ian
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