Most transparent power amp

Julius Futterman H3AA's driving Quad 57's and KLH Nines! I first heard these back in 1978 and the sound quality is indeed a benchmark for openness and transparency!

My brothers upgraded Tenor amplifier amp $25 k range,which uses I believe small input  tubes as well as big Solid state power. Is probably the most musically involving amplifier I have heard .that being said preamp, digital or turntable, as well as cables and of course a Loudspeakers all contribute to the success of that amplifiers greatness .
my system sounds very respectable at just under $50k,but compared to my brothers $100k + system I can pick out things maybe lacking in my own system
when directly comparing to. My point is, your system is only as strong as its weakest link .

this will have people posting the most transparent amp they have, and not Thee most transparent, which by the way also depends on the rest...
Gryphon Mephisto
Coincident Franks/Dragons
Pass
Benchmark AHB2
Bryston are incredibly transparent, very good amps, but doesnt make them the best...

Benchmark AHB2 is the most transparent I've heard.  It supposedly has the lowest SNR/noise floor available.

I highly recommend the Bryston cubed series, choose the size that fits your setup and you can't beat the warrenty.