Sean: I still have my Phase Linear 400 from 1971, still runs. Not much current for speakers less than 4 ohms, but works fine with anything else. I ran the PL 400 about 2 months ago with the Radians, a little lean on the high end, the bass response was surprising good, the midrange a little soft, a little gritty, edgy, but really not half bad either, though tiring after a hour or two.
Amplifier design / Bob Carver's thoughts
Here's an interesting article i ran across. For those that are interested in how devices work and the decisions that engineers make when designing a product, try taking a look at this article. It is an older interview with Bob Carver and gives background on the how's / why's of the Sunfire designs and why he chose the design attributes that he did. Obviously, the specific decisions made when designing any product are a matter of subjective preferences and some may not agree with Carver's personal designs / take on things. Having said that, the info provided here may help some of you that are less technically inclined understand how an amp works and what the various trade-offs are. Good reading, even if you don't like "Sideshow Bob". Sean
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Design attributes of the Sunfire amplifier
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Design attributes of the Sunfire amplifier