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thasp: 20-25 years ago, weight was a good metric of a quality power supply. I'm not so sure that weight is a good metric any more. In the mean while, there have been better transformer materials developed such as "hypersil" which will drastically reduce overall weight. "Switching" power supplies have also become "standard" in much electronic hardware. So, I think that you need to look a little further than just the weight metric to determine the quality of an amplifier.