Relationship of amplifier sound to transformer quality?

One of the reasons Jadis electronics sound so good is their hand-wound transformers. 

Jap manufacturer Hashimito transformers compete just as great as Audio Note hand-wounded transformers.

Thanks bdp24. Do you know which transformer manufacturers are most highly regarded?

Two tube power amp designers/builders who say yes are Tim de Paravicini (EAR-Yoshino) and Roger Modjeski (Music Reference). Roger will personally hand wind you one for $1,000. Tim says he can tell you how an amp reproduces bass by looking at the transformer.