Harry Pearson gave the Sapphire 300B monoblocks an Editor's Choice Award in The Absolute Sound's 2008 Editor's Choice Awards.
The best single-ended amplifier in my experience. More punch than its puny 18-watt rating would suggest, with less of the harmonic coloration that some, including me, find so colored, in the sound in other SET designs. Used with a relatively sensitive speaker, which I would urge you to do if possible, it is a revelation, and at both frequency extremes, and as they say, utterly natural in between.
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