It turns out that there aren't that many options in the 400W category but, as ever, Google is your friend. My Google-Fu directed me to a company that is not well known in the amateur radio world but which must, surely, have at least one radio amateur on its staff, as they produce a really rather nice 550W "gain block".
The Enigma Broadcast PA144-500 takes about 3W of RF, adds 50V at about 15A, together with a large dollop of "dark art" engineering and turns it all into 500W RF output.
Each amplifier comes with a test report detailing gain, efficiency, harmonic content, etc. backed up with spectrum analyser screen captures of the individual unit under test. The company also provides generic 2-tone test data obtained during the module's development. The numbers are quite impressive, auguring well for a nice clean (and loud) signal from G3WGV!
Of course this is only part of the overall amplifier. To this must be added a substantial power supply, cooling systems, Tx/Rx changeover relays and control circuitry/processing. And a case to put it all in, of course.
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