Grant Fidelity B-283 Tube Buffer (description below taken from internet) I have 2 of these units available at $100 each My price is firm. Please no lowball offers or trades. This Tube Buffer is for those who desire great tube sound on a budget. All precision hand made with high quality audiophile components. Simply patch this into your system for instant tube enhancement without replacing your existing system with tube components. Ideal add-on for CD/DVD/MP3 players and computers. Specifications: Frequency Response: 5Hz - 50 KHz (-1dB) Distortion: < 0.15% @ 1kHz S/N Ratio: >75dBa Input Sensitivity: 500mV Vacuum Tubes: 6J1×2 Crosstalk Separation : >75 dB Enhanced sound staging and details. Warms up sterile digital music and solid state amplification. Does not remove any musical information. * Musicians love this for enhancing the sound of their instrument's amplification. * Connects to your existing system in many ways, including; Between your CD or DVD Player and your Receiver/Amplifier, Between your Pre-Amp and your Amplifier, in your Receiver/Amplifier pre in/out loop, Musicians and Recording Engineers will find many unique ways to hook this up. Many more ideas at www.grantfidelity.com * Quality Gold Plated RCA inputs/outputs. No 'thump', power switch. * Small and attractive styling with brush aluminum plating. Easy to use and maintain. * Custom hand-made oversized transformer, all point to point hand wiring. * 5 x 7 x 5 ¼", 6 lbs