Re: The Audiophoolery Thread.
The Radfords appeal from the technical point of view, the triode-pentode phase splitter representing genuine and pragmatic development of the basic 5-20 theme, as opposed to merely tweaking an application note. The Quads strike me as stretching minimalism a little too far, with the well-known KT66 unwisely-high grid resistor drawback being a manifestation of this.
What all three represent is the art and science of getting output transformers to work well over the audio range- something that just doesn't trouble the modern transistor amp designer, and saves him/her a lot of money, time and brow-furrowing!
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