Audio Research SP-16L Line stage tube pre-amp in black. Unit comes with all original packing, remote, manual, etc. This pre-amp uses (3) 12ax7 tubes. I will be including in sale three sets of tubes. Mullard CV4004 premium matched from Upscale Audio. Sylvania 1959 NOS tubes. and Electro Harmonics new production tubes. All are sets of three. The pre-amp is immaculate well taken care of. No issues. Rated consevative at 8 of 10 being used. I will answer all questions, however I will not respond to low ball offers, sorry.