Most transparent power amp

Sorry I meant F4, the signal still still passes through active IRFP240-9240 Mosfets, so it's not passive, even if it has no gain, it's still active

Cheers George  

I think David Berning amps have been mentioned. Linear Tube Audio amps are just as transparent and also designed by David Berning.

I believe the Benchmark amp has only 9db of at the lowest gain setting. 

I've been using a pair of Valvet solid state single ended mono blocks for a few months now & am finding them very transparent & musical. My history has been tubes of various designs for the last 25 years so this was a bit of a departure. I'm hearing more on top and bottom now while still having a very satisfying midrange.