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....The LF100 was sold for about two years and recently I've moved to the Mark II version, which was in fact used in the very first Soraya retail amp. It's a more sophisticated version of the original Lifeforce, with many subtle modifications for better performance.The input stage carries a current mirror, proprietary matched input pairs were adopted, more linearising degen is used on the VAS, which is now buffered, and the power supply is an upgrade too, with care taken to quarantine the high charge pulses off the rectifier bridges (four in total) into one but not both caps. This reduces intermodulation with the final filter cap, improving resolution, a trick not possible if only one cap is used.The Mark II is an enhanced module, sold for the same price.The Soraya has moved on, and is now three versions removed from the Mark II, with the very latest version in 150W//8R being bedded down right now!We never sleep at Aspen....... groan Cheers,Hugh