This is the bare PCB of a tube-based, 2-way electronic crossover, based on ARC's EC-2. The circuit uses two 12AX7A low noise triode tube in each section to carry out low pass and high pass filtering function. The board can be configured as crossover frequency of : 50Hz , 100Hz, 200Hz, 400Hz, 800Hz, 1KHz, 1.5KHz, 2KHz, 3.5KHz and 5KHz by changing two ( or three) components, using the component values in the table provided. The board contains the power supply section and is thus more integrated than the original design. The audio section adheres closely to original board as shown in the pictures. PCB dimension : 120mm x 230mm. PCB thickness : 2mm, 2 oz ( 75um thickness !!) copper deposition. We do air shipping worldwide at US$7.00. We welcome combine shipping. Powered by SoldEazy