From The Builder: 100% hand built, Stereo phono Tube Pre-Amplifier with all handwired, point to point circuitry using 12AX7 tubes. This Preamplifier is designed to furnish the voltage gain and equalization necessary to operate moving magnetic phone cartridges, providing the RIAA Equalization for phone records. Preamplifier has two stages of amplification in each channel. A hum control pot is provided and can be adjusted if necessary. This preamplifier has dual input and output jacks which will accept standard phono plugs. The input impedance is 47,000 ohms(47K) and has a gain of 44db. It features one pair of inputs, one pair of outputs, power switch, power indicator, IEC plug and circuit protection. You will be amazed with the sweet, warm sound of this pre-amp. Included: Phono Stereo Tube Pre-Amplifier AC, 115 Volts Tubes: Two 12AX7(can be substituted with ECC83/ 7025) Power Cable Not Included $185