I dont know, NAT is very good value for performance, I didnt feel the transmitters to be up to the level of the prestiges though if that is of any help. The prestiges were more neutral, threw a significantly larger stage, and imho had superior rendering of texture. Their predecessors, the Audio Sculpture Ultima’s ran at even higher voltages, 1.5 times the rated power output, and are tube rectified. There’s a pair up for sale but the refurbish cost will be considerable. I do have spare Sic Safco high voltage capacitors which I had to order a bunch from as they’re custom order only so I am tempted from time to time to pick these up