Aesthetix Calypso

I am ready to audition, and probably purchase, an Aesthetix Calypso line stage pre amp. My current pre-amp is the Audio Research LS 25 mk1.

Have the newer Calypso units solved the noisy tube problems? I just realized that this unit has very few tubes (only 4) and may be easy to tube roll. What are the recommended tubes to use? What else should I be aware of or look forward to hearing?
I went from ARC LS25 MK1 to Calypso, and there is no going back.
Too much info to reiterate here. See my thread on LS 25 vs Calypso.

and my input on this thread...

The Calypso is an amazing value in high-end audio.