After Michael Fremer reviewed the darTZeel NHB-18NS full-function preamplifier in the June 2006 issue of Stereophile, he bought the review sample. He subsequently replaced it with the NHB-18NS Mk.2, which he wrote about in June 2017. It has been his reference preamplifier ever since.
Although I performed a complete set of measurements on the original NHB-18NS, I never did so on the Mk.2. As darTZeel had sent a new sample of the Mk.2 along with the NHB-108 Model Two power amplifier that Jason Victor Serinus will…