Looking at these specific preamps give me your opinions

Knowing the story behind it and the people involved with the design and implementation I would most certainly look into the Revelation Raven. My suspicion is that it's truly superb.

Charles

Backert Labs, it’s been the preamp of my dreams! The love affair continues. It’s quiet, detailed and though neutral, there is real magic in how it has made my 300B’s sound with O96’s. You can’t beat it!

+1 @pindac

Raven preamplifier Got one (need to update system page). Full stop. Done.

If you stream or will be adding one you could think about the Grimm MU2. Stream/DAC/Pre/Roon core all in one. While I’m all for separates except not with the stuff Grimm makes.

Of the preamps listed, I can comment on the LTA microZOTL, as I have this in my system. I think it is a spectacular preamp. Not warm sounding, but very natural. Excellent dynamics and very open sounding. I run it with a Pass amp and could not be more pleased.

I also just rolled in some new tubes to replace the stock tubes it comes with. I thought it sounded good before, but it was next level afterwards. Better top to bottom extension, more organic. A real winner for my system.

cbrez: What tubes did you decide on for your upgrade replacements?