This is the bare PCB of a tube line stage pre-amplifier with reference to the legendary UK classic Matisse Reference. Matisse Reference was the flagship of this brand's preamplifier family. The layout has special focus on the routing of ground to give the full potential of this clean and tidy design. Supply voltage : 420Vdc for the High tension portion ; 12.6Vdc for the filament portion. We provide schematic with this auction by EMAIL to buyers. PCB dimension : 176mm x 212mm. We do air shipping worldwide at US$7.50.