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Title: Possibly the best amplifier in the world. Post by: Opcom on December 24, 2012, 12:51:00 PM http://www.ebay.com/itm/12V-Battery-Tube-Headphones-Amplifier-Possibly-the-best-amplifier-in-the-world-/330846000577?pt=US_Pro_Audio_Amplifiers&hash=item4d07f555c1&nma=true&si=27f5mFrqNdtHax9z1%2B0QAVLUxzo%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 "This amplifier is only suitable for high impedance stereo headphones like the Sennheiser HD-580. Specifications: Bandwidth DC to >>MHz Battery operation with 12V (UPS type battery, not included) Power consumption < 7W Extremely high input impedance >>MOhms No resistors, potentiometers No Capacitors No Transformers, Inductors No solid state, diodes, transistors, FETS, ICs Signal amplified by only 2 electron tubes in class A operation Only suitable for headphones with impedance >150, <600 Ohms Headphones can damage hearing at high levels. Please make shure you attenuate your signals adequately before sending to this headphone amplifier. For the schematic please visit my other listings." |