Everyone has elegantly stated the positives of outboard power supplies. What about the negatives? I can name two. 1)RFI riding on the cable conneting the supply to the preamp will go directly to the circuit as opposed to RFI riding on a power cord which goes into the transformer. 2)Cost.
Seperate Power Supply and Preamps
Several of the top end tube preamps like Hovland, Joule Electra, Herron, and Lamm have no seperate power supply. Others like First Sound Presence, Atma-sphere, Cary, have seperated out the power supplys with some of their models. What are the advantages of this sonically or is this just a physical limitation problem with the manufacturer?