I've got a Millennia STT1 and have been trying the Avalon 737 as a second preamp. I only record vocals and acoustic guitars (mics: Brauner Valvet and Neumann TLM 103). But the 737 gets bashed quite a bit in most forums. Next to the Millennia it pales a bit on all fronts (preamp, eq, certainly comp) and it also does not provide sufficient variation I think. But I do like the tube sheen the 737 gives on vocals (more pronounced than the tube topology of the Millennia). So given all these facts, what would you think to be a good second preamp. Cheers, Bob.