A single-end triode amp like my Sanei SA-560A (2A3's and Tango transformers) would be a lot better than the SS Yamaha! Those Cornwalls have a sensitivity of 100db/1watt. Most of your listening is at or below 1 watt. SE tube amps are "magic" at the 1 to 7 watt level! Provided of course that the speakers are of high enough sensitivity (Heresy's, Khorns, Cornwall's ...). So changing to another DAC is IMHO not a good idea!
