Here it is, the most expensive amplifier we found, the Wavac SH-833. You need two of them, and that'll cost you a cool $350,000. "This is a Hi-Fi monoblock amp which has achieved world first Class A 150W single ended. This model has the most powerful output in the world as a Class A directly heated triode single ended amplifier." www.wavac-audio.jp/sh833_e.html