I suspect the difference in the LP275-to-smaller-CJ-tube-amp comparison is what the reserve inherent in the power supply of each is capable of delivering at a given listening level. It's not just scale (i.e., the perceived "size" of the presentation) or macrodynamics but the revelation of inner detail that fleshes out image, location, dimensionality, and tonality. If there's more reserve (meaning that the amp doesn't have to work as hard at a given level), there's more "there" there. I also suspect the difference is audible when the comparison is done on "smaller" as well as "larger" speakers.
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Jim
Bedroom:
Aurender N150-->Bryston BDA-3-->EMIA Elmaformer Cu passive line stage-->conrad-johnson MF2500-->Paradigm Studio 20 v.5
Wireworld Eclipse IC and SC
Shunyata Delta D6, Alpha XC, Delta NR v.2, Alpha USB; Altaira CG Hub
Stillpoints Aperture II; Ultra SS; Ultra Mini
GIK Monster; 242
Butcher Block Acoustics Maple Platforms
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