Mastersound Spettro Tube preamplifier Dual Drive System in Class A Minimum Use and almost MINT condition Sale price: US$6,999.00 + actual shipping cost(US Retail Price: US$15,000 plus tax) Latest model that has XLR input and output, uses low noise 12AU7 tubes and its dual drive system will give you a low noise, neutral, detailed, transparent, powerful, dynamic sound, lots of drive to the amplifier of your choice. No type of integrated circuit is used in the Spettro. Everything has been designed for the state of the art. Spettro has a pair of parallel preamplifiers per channel (Dual Drive System), with the main intention of halving the output impedance. In fact Spettro has four preamplifiers inside, this allows to have more signal control. It is capable of emitting an audio signal of truly amazing speed and dynamics. Power amplifiers driven by this preamplifier can really express all their possibilities. Between the phono stage and the pre stage there are 7 double triodes and all the components are highly selected and custom made. Furthermore, the power transformer is designed and manufactured in our company. The Spettro, of course, can be combined with any type of power amps and thanks to its main characteristics and the low output impedance it facilitates the various possible combinations, but with our mono amplifiers or with one of our integrated ones using the Direct input certainly expresses its potential to the maximum. A new concept in preamp technology that revolutionizes what has been done so far. With the original double-box and the never-used brand-new remote control Mastersound Spettro tube preamplifier “Dual Drive System” in Class “A” specification: Technical Specifications:Class A DesignTubes: 5x ECC802 (12au7), 1x ECC83 (12ax7)RCA Inputs: 4x line level, 1x phono (MM)XLR Inputs: 1x line levelRCA Outputs: 1x pre-out, 1x line levelXLR Outputs: 1x pre-outRIAA Curve: +/- 5 dBInput Impedance: 47K ohmsOutput Impedance: 450 ohmsBandwidth: 1 Hz to 100 Khz, 0 dBIncluded Remote ControlDimensions: 17.75 x 15.75 x 5.25Weight: 22 lbs. (10 kg)?Board with Gold TracksElectricity: 110V (The input electricity voltage can be easily converted to 220~240 volt. Please consult with the factory)