As I've recently posted on another similar thread, I have my doubts about a 65 Watt Single Ended Triode being able to properly handle the 3.7's 2.5 Ohm impedance and it's accompanying phase angle. They might be better suited to their own 101dB horns (horns are not my cup of tea).
At $35,000 the pair, or about three times the price of a pair of the more expensive Thiel's, I suspect they will have limited appeal to Thiel owners.