What is Included: Phono Preamplifier, Four National 6922 Tubes, Four Electro-Harmonix 6922EH Remote, Manual, Power Cable, Factory Packaging and shipping box! For your consideration I have a beautiful audio research phono preamp model ph-5. This unit is a hybrid Fet and tube phono preamp. Current tubes are a set of vintage national 6922s with about 500 hours of use on them. I also have The original matched electro harmoix tubes that came with the unit new, these will be included. It has RCA inputs and outputs as well as adjustable loading via buttons on the front or from the remote. Unit is in impeccable condition with no major scratches or scuffs noted. It has the original remote along with the original shipping box all the paper work that came with it including owners manual. About a year ago I did an overall performance check up on the unit and it still performs well within spec with no issues found (I am a trained technician) I’ve owned this piece for about 4 years and have enjoyed it and taken care of it in that time. Unit will be packed in original shipping box but will be double boxed as well. Have any questions? Feel free to message me! Here are some specs from audio research: Frequency response±.25dB of RIAA, 10Hz to 60kHz; 3dB points below 0.7Hz and above 400kHz.Distortion (THD)Less than .005% at .50V RMS 1kHz output.Noise & hum0.16µV equivalent input noise, IHF weighted, shorted input (76 dB below 1mV 1kHz input).Gain57.5dB at 1kHz (MC & MM compatible).Input impedanceSelectable 47K , 1000, 500, 200, or 100 ohms with 200pF unbalanced.Output impedance200 ohms unbalanced. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum.)Output polarityNon-invertingMaximum inputs70 mV RMS at 1kHz (180 mV RMS at 10kHz).Rated outputs50V RMS 10Hz to 60kHz, 100K ohm load (output capability is 50V RMS output at 1/2% THD at 1kHz).Power suppliesElectronically-regulated low and high voltage supplies. Line regulation better than .01%.Tube complement(4) 6922/E88CC dual triodes with JFET input. Solid state power supply.Power requirements100-135VAC 60Hz (200-270VAC 50/60Hz) 50 watts maximum. Line fuse2A SLO BLO (1A SLO BLO 230V).OtherOutput polarity: Non-inverting. Push buttons: Power, mute, mono, load. Detachable A.C. power cordDimensions19 (47 cm) W x 5.22 (13.2 cm) H x 10.0 (25.4 cm) D. Rear chassis fittings extend .6 (1.5cm).Weight11.3 lbs. (5.1 kg) Net; 19 lbs. (8.6 kg) Shipping.