This is an assembled kit of a tube amplifier power supply circuit with soft start for both the high tension section and the filaments. The board provides soft start of high tension when power is turned on. The voltage slowly rise from 0V to 300Vdc(adjustable from 100Vdc to 300Vdc). Similarly, the filament voltage is slowly raised from 0V to 6Vdc( adjustable from 1.2V to 12Vdc). The filament power supply section contains two individual supply each can provide up to 1.5A of filament current. The assembled board contains some used capacitors but the board function is fully verified. The board requires AC 240V and 12V input from a transformer. Board size: 127mm x90mm. We do air shipping worldwide at US$12.50. We welcome combine shipping. Powered by SoldEazy