Anyone compared BAT Rex vs. Atmasphere MP-1?

Maybe Victor's business partner can provide a view on the MP-1. This thread seems to be heavily biased towards the BAT...

Sonic attributes of the Rex include:

Very dynamic, clean, energetic.
Highlights midrange texture and harmonies.
Bass is excellent.
Treble is open and extended.
Noise is very low.
Very powerful sound.
Switch between 6C45 and 6H30 provides two flavors.
Build quality is at the top.

Those looking for warmth and forgiveness should look elsewhere. This will dig deeper into the music. I have no clue why people say BAT is 'dark'. I would never charactarize this preamp as dark.

Adding NOS 6H30DRs will up the excitement factor (2 out of 8 in the power module is enough for me).

I think the Joule LA450 and the Audio Reference Anniversary Preamp could be intriguing alternatives, but I have not made a comparison and am not particularly concerned to do so at this time.

Raquel, just for clarification, the BAT should be left on standby when not in use? Just not 'on' 100% of the time. One could turn it off if going away for some time.

I thought the initial surge of current into a cold tube was the detrimental factor.

I also hear no sonic difference within 5 minutes of coming from totally off, vs. 5 minues of coming out of standby.

I'm not sure why Stereophile had problems with the 5AR4s. These Sovtek tubes cost $20 each, so it is not a big deal. Nonetheless, something must have been not quite right, and I agree to burn-in the unit for a few hundred hours for a review. Also, it is practically unheard of for a NOS GZ34 to die. Some of these have been in operation for a few decades.