Class D, that reminds me of when I was selling Hi Fi while going to college in the late 70's. Yes there was the Infinity, the same vintage as their classic FET preamp and Sony also had one, the TAN 88B I believe. I had a couple of those. Great bass was their claim to fame. The Infinity was very smooth by comparison to the Sony, but not too reliable as I recall. We used to use it on the Infinity QLS 1's.
