Audio Research’s Phono Stages has been making speakers disappear in high-end vinyl systems for years. The current PH9 is fully single-ended from input to output. The PH9 uses a combination of J-FET input stage technology (for low inherent circuit noise) and class A operation vacuum-tube gain via three 6H30s. The PH9 also adds the ability to adjust load impedance, output impedance and a host of other operations VIA the front panel menu. This super clean unit just came in on trade and looks and sounds beautiful. 434 hours on original tubes (4000 hour life). If you’re ready to take your system to the next level, this is a piece that can take you there. FEATURES -Tube power supply and phone stageFully remote controllableHeavy aluminum face and chassisGold plated inputsUpgradable power cord SPECIFICATIONS -FREQUENCY RESPONSE: ± .15dB of RIAA, 5z to 20kHzDISTORTION: Less than .015% at 3V RMS 1kHz output.GAIN: 58dB at 1kHz (MC & MM compatible).PUSH BUTTONS: Power, Mono, Load, Mute.INPUT IMPEDANCE: Selectable 47K, 1000, 500, 200, 100 OhmsOUTPUT IMPEDANCE: 200 ohms Unbalanced. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum.)MAXIMUM INPUTS: 80mV RMS at 1kHz (180mV RMS at 10kHz).RATED OUTPUTS: .50V RMS 10Hz to 60kHz, 100K ohm load (output capability is 30V RMS output at 1/ 2% THD at 1kHz).POWER SUPPLIES: Electronically-regulated low and high voltage supplies. Line regulation better than .01%.NOISE: 0.16uV equivalent input noise, IHF weighted, shorted input (77 dB below 1mV 1kHz input).TUBE COMPLEMENT: (3) 6H30 dual triodes, (1) 6550WE and 6H30P in power supply. POWER REQUIREMENTS: 100-135VAC 60Hz (200-270VAC 50/60Hz) 80 watts maximum. Line fuse 3A SLO BLO (1.5A SLO BLO 230V). DIMENSIONS: 19 (48 cm) W x 6.5 (13.7 cm) H x 13.7 (34.8 cm) D. Rear chassis fittings extend 0.6 (1.5 cm).WEIGHT: 15.4 lbs. IN THE BOX -Original double box Original remote controlUpgraded ARC metal remote controlCase toolOriginal ManualPower cord CONDITION - Unit is scratch free and is from a smoke, pet and child free home. Tested and all functions are working as new. SHIPPING - We ship worldwide with USPS and Fed-Ex and various truck freight lines for items weighing over 100 lbs. All items are packed and padded with care if the original packaging is deemed insufficient. We know how exciting it is to anticipate the arrival of new gear and we want your item to arrive in the same condition it left our facility. Current Retail price - $10,000