I have constructed a single ended MOSFET amplifier, similar to Nelson Pass' Zen amplifier. I have made some power supply changes and some input and output changes. This amplifier sounds very good with the Quad ESL's. My version of the Zen produces about 8 watts per channel.
The schematics and parts list can be found on my Audio Schematics Page
Here is the reference to Pass' two articles on this amp:
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Author: Nelson Pass
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Title: The Pass Zen Amplifier: 10W of Single-Stage Single Ended Class A
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Magazine: The Audio Amateur
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Date: February 1994
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Pages: 10-15, 42
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Author: Nelson Pass
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Title: The Return of Zen Upgrades to the Single-Stage, Single-Ended Class A MOSFET Amplifier
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Magazine: The Audio Amateur
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Date: March 1994
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Pages: 20-21