I am not a big tube fan. I find I lose resolution, but the holographic sound of tubes is very nice.
I heard the Allnic line of DAC and preamps and I was floored because it has both great resolution and a holographic sound with the tubes. After some research I concluded that it was not the tubes on the Allnic that was making it great, it was the OTL/OCL output stage of the Allnic DACs and preamps.
Now I cannot afford Allnic gear at this time and I lucked into discovering the $500 Schiit Valhalla 3 OTL/OCL headphone amp / preamp. I am only listening to it as a preamp. It is not practical for most setup, single input, no remote.
If you are someone that is a bit disappointed in tubes because of the not-so-great resolution. Listen to an OTL/OCL design. I only know of Allnic and Schiit that have this.

