@rmasoni has personally recommended it on the tube amp thread I asked for input on:
"Call David Berning directly and ask him to tell you about his 300B or 6B4G push-pull amp that he builds on request. It is spectacular. His ZOTL circuitry, fully balanced, Class A. He included 47 step Goldpoint attenuator when he built mine - so it can be used as an "integrated", albeit with a single input (either RCA or XLR). Will cost you around $7K, but there is nothing like it - check out Harley's double down on the Flagship 211/845. You get the same sound in a smaller package."
"Call David Berning directly and ask him to tell you about his 300B or 6B4G push-pull amp that he builds on request. It is spectacular. His ZOTL circuitry, fully balanced, Class A. He included 47 step Goldpoint attenuator when he built mine - so it can be used as an "integrated", albeit with a single input (either RCA or XLR). Will cost you around $7K, but there is nothing like it - check out Harley's double down on the Flagship 211/845. You get the same sound in a smaller package."