The power amps, though, are where this build really shines. For the sub, [Gregory] built a wonderful monoblock tube amp, able to push nearly 300 watts into a subwoofer. The other channels for this ...

In some instances, this figure might rise to around the 100W mark. But Audio Research’s new Reference 330M monoblock power amp takes this to a whole new level with, you probably guessed ...

What you're looking at is the Audio Research Reference 330M power amp, a fully balanced, pentode-mode monoblock design with a quite extraordinary (for a valve amp) 330W power output, more than ...