Vacuum tube headphone amplifier. Model HP-V8 is the high-end stand alone vacuum tube amplifier dedicatedly designed for headphones using the legendary 300B for power tubes for the first time in the industry on headphone amplifier. The Signal to Noise ratio as good as 115 dB achieved by the Fostex proprietary ST-PC technology as well as thorough noise reduction countermeasures reveals the authentic power of the tubes. Output transformers are custom-made by Hashimoto Electric complying with balance and unbalanced outputs. The base plate made of aluminum weighing 2 kg and the OFC (Oxygen Free Copper) plate with Teflon washers used for the power tube socket to minimize vibration noise. High anti-vibration rubber feet isolate the chassis from the floor. Pure audio grade electronic volume is used to eliminate the gang errors between L and R volumes. Custom-made electrolytic and film capacitors are adopted.The audio grade AC Inlet is made by Furutech. Impedance: 600 Ohm. Frequency response: 20Hz - 50kHz. Max. SPL: 2000 mW / 16 Ohm. S/N: 115 dB. Dimensions: 430 x 245 x 416 mm. Weight: 31 kg.