Glad to hear the + upgrades are equally positive for the Ref 40. Those who are interested in learning more about the latest Ultralinear can see my comments which were updated today after adding a second amp to achieve monoblocks.
LTA ZOTL40 Reference+ Amplifier
Linear Tube Audio ZOTL40 REFERENCE+ AMPLIFIER is up on their web site. The sound is incredible. If you thought it couldn’t get any better then you were wrong. Contact Nicholas
https://www.lineartubeaudio.com/products/zotl-40-reference-amplifier