Note on 17 March 2016 : This is a relaunch of this board. There was a transistor footprint problem and it was solved in this version. This is the bare PCB of a DC high voltage regulator, intended for tube preamplifier application. The circuit is based on the power supply circuit of Matisse of UK ( which is already out of business). AC input : 360Vx2 AC. ( from the secondary of an appropriate transformer) DC output : 110VDC to 280VDC. Board Thickness : 2.0mm Dimension : 120mm x 124mm We provide schematics and part list to buyers by EMAIL. We do air shipping worldwide at US$6.00.