Amplifier brand/designer with the most unique and consistent “house sound?”


This concept of “house sound” has been pretty fascinating to absorb and consider.  Who here knows amp brands and their house sounds well enough to comment?
redwoodaudio
James Bongiorno for his work with SAE, Dynaco, GAS, Sumo and SST! He designed some of the best SS amps ever: SAE MkIII, Dynaco 400, GAS Ampzilla, Sumo Andromeda and the Nine, SST Ampzilla and the Son! A record spanning four decades! 
I agree with both Ayre and Pass.  Very consistent sounds, but perhaps for different reasons.

Ayre uses the diamond output stage, Pass deliberately looks for circuits to add euphonic distortion.

After these two, Parasound.