Stradi minus varius equals ? – Premium audio tubes from South Korea branded Stradi by ZeroMountain is the answer. With currently 23 models in the catalogue, the company's talking points for construction are ladder-style frame grids; structural reduction of filament end loss; electrophoresis coating; triple-mica structures; dual getters; 10E-9 ultra-high vacuum; stringent tube testing; and eco-friendly paper packaging. The portfolio includes DHT favourites like 300B, 2A3, 45, PX25, PX4 and AD1 plus rectifiers like 5U4G and, forthcoming, 274B. Tube fans can now add South Korea as a current-production destination beyond Czechia, Slovakia, China, Japan, Germany and the US.
