I have a lunch box with 2 of his 312A preamps and a 1 space 2 channel rack of vintage API. His preamps sound better than the APIs. I use them on a lot of different sources, drums, guitars, vocals, and I prefer the his to the old. I could have a less than perfect set of old APIs so take it for what is worth, but I have heard his new preamps against a few different set of older ones and I dont think you can go wrong buying his.