Back in 1987, J. Gordon Holt & Martin Colloms set their sights on the Audio Research M300 monoblock power amplifier
. "After having proven that vacuum tubes could do some sonic things better than transistors, Audio Research is now endeavoring to show that transistors can do most things better than tubes," says JGH, adding that the then-new M300 is a "hybrid amplifier . . . it's half tube, half solid-state."