FM Acoustics' website claims "proprietry enhanced class A circuitry".
Goldmund uses what they call "JOB5 circuit" (orignally invented by several grad students).
Dartzeel won't even say what circuit they use (but speaker cables MUST be connected b/f operation).
neither FM nor Goldmund makes use of massive transformers, capacitors, nor heatsinks commonly found on other high-end amps (in fact, pics of their innards show them to be mostly hollow), yet all 3 hv high bandwidth/current, are relatively lightweight, & run cool to the touch, etc. i'm not aware of any other Class A amp with these characteristics.
the Swiss does do a thriving trade in professional audio components. i believe companies such as FM Acoustics, Nagra, Weiss, etc. all started out this way. although this does not necessarily mean they'd make good audiophile components, it does show they are investing a fair amt in R&D.
as for Nobel prizes, i don't think they give these out for superb amp (or elec circuit) designs at the moment.