Magnificent sounding pair of Audio Research Balanced Tube Mono blocks with over 200 glorious tube watts of power enough to drive almost any reference loudspeaker. This pair uses 8 KT120 tubes per channel and, unlike the recent power amplifiers from ARC that use solid state power regulators, uses a tube regulated power supply with a 6550 tube. I have run many loudspeakers with these mono blocks and compared them to many other state of the art amplifiers. I have not found anything that comes close to the majestic sound of these behemoths. They are simply unparalleled in my listening experience with both electrostatic and dynamic speakers. This pair is offered with a complete set of two unused brand new tube sets (32 KT 120 power tubes) besides the 16 KT 120 tubes already in the amplifiers. That’s roughly 48 KT 120 tubes that at current market prices for these tubes is worth several thousand dollars. You will not need new tubes for a long while with these amplifiers. Some points to keep in mind in deciding whether to buy these amplifiers: 1. These are large fan-cooled tube amplifiers that are fully balanced. You’ll need the place them in a room with sufficient ventilation as they run pretty warm. 2. I used these with ARC Reference tube preamplifiers. You can use them with other balanced preamplifiers or DACs that have a volume control. 3. The Bluebook value as attached is around $5000, which does not include the two spare new tube sets I am including with mine. Do your research and see what 32 KT 120 tubes cost (mine are factory matched octets, which are being sold on eBay for $1000 per octet). 4. Check the weight and size of these amplifiers. They are around 90 pounds each in their factory boxes. Shipping costs will be considerable. No international shipment of these amplifiers. I welcome local pickup if you are in the San Francisco Bay Area. 5. The physical condition is as shown, and reflects several years of use. The front panel looks as shown in the pictures. The covers are fastened with a lot of screws, and I think I’m missing a couple of screws on each amplifier. But each amplifier cover is held with over 20 screws, so they are plenty there to hold each panel tightly. 6. The custom made wooden stands are not included with the sale. 7. This is a top of the line audiophile amplifier. Don’t bid unless you know what it takes to set up and install each amplifier. Bias for each power tube is set with two remote controls as shown. Unlike current ARC amplifiers, these use a digital power meter and bias values are shown in a large digital readout (which I prefer). 8. These are considerably more powerful than the largest current model 160M ARC amplifiers that cost close to $35,000! At this price, they are a bargain! They are so well built that they will last a lifetime with careful use. 9. Keep in mind there are two boxes, one for each amplifier. On Mar-14-24 at 16:39:00 PDT, seller added the following information: Added the option of local pickup. Also wanted to add that the amplifiers will come with two custom made plastic covers.

Audio Research Ref 10 Stereo Line Stage Preamplifier MSRP: $35,000 Color: SilverThis preamplifier is in excellent condition and functions flawlessly. This is one of the best stereo preamplifiers on the market and it sounds absolutely phenomenal. This preamplifier has zero hours on the tubes as shown in the pictures. It includes the original packaging, remote, user manual, tubes (zero hours), chassis interconnects, and power cord. Do not miss the chance to own this amazing preamplifier at an unbeatable price. Electronic SpecificationsFREQUENCY RESPONSE+0 -3dB 0.1Hz to 200kHz at rated output. (BALANCED, 200k ohms load.)DISTORTIONLess than .006% at 2V RMS Balanced output. GAINMain output (SE or BAL input)12dB Balanced output, 6dB Single Ended output. Tape output: 0dB. (Processor input: 0dB Balanced)INPUT IMPEDANCE120K ohms Balanced, 60K ohms SE, Inputs (7): 1, 2, 3, 4, 5, 6, PROCESSOR. (XLR and RCA connectors).OUTPUT IMPEDANCE600 ohms Balanced, 300 ohms SE main (2), 20K ohms minimum load and 2000pF maximum capacitance. Outputs (3): 2 main, 1 tape (XLR and RCA connectors).OUTPUT POLARITYNon inverting.MAXIMUM INPUT20V RMS maximum Balanced, (10V RMS SE).RATED OUTPUTS2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 30V RMS at less than 0.5% THD at 1kHz).CROSSTALK-80dB or better at 1kHz.CONTROLSVolume (104 steps). Push Buttons: Power, Mute, Interactive Touch Panel. Rear RS-232 control and IR input.POWER SUPPLIESElectronically regulated low and high voltage supplies. Automatic 40 sec. warm-up/brown-out mute. Line regulation better than .01%.NOISE1.7uV RMS residual IHF weighted balanced equivalent input noise with volume at 1 (109dB below 2V RMS output.) TUBE COMPLEMENT(8)-6H30P dual triodes, plus (2 each) 6550C and 6H30P in power supply.Check out my other listings.Feel free to ask any questions.I ship items only to buyers with signature required on items above $750.NOTE: Returns not accepted.

Audio Research Ref 10 Phono Stereo Preamplifier MSRP: $35,000 Color: Silver This preamplifier is in excellent condition and functions flawlessly. This is one of the best stereo preamplifiers you can get from audio research and it sounds incredible. It comes with the original remote, user manual, chassis interconnects, 20a power cord, and a zero hour tube set. Do not miss the chance to own this amazing preamplifier at an unbeatable price. Electronic SpecificationsElectronic SpecificationsFREQUENCY RESPONSE ± .2dB of RIAA, 10Hz to 60kHz; 3dB points below 0.3Hz and above 300kHz.DISTORTION Less than .002% at 1.0V RMS 1kHz output.GAINSelectable 51dB (Low), 74dB (High) at1kHz BAL; 45dB (Low), 68dB (High) at1kHz SE. (MC & MM compatible).BUTTONS Front (2) Power, Mute.INPUT IMPEDANCE 47K ohms and 100pF SE. Selectable loads 1000, 500, 200, 100, 50 ohms and Custom.PHONO EQUALIZATION(Selectable) RIAA, Columbia, Decca.OUTPUT POLARITY Non inverting.OUTPUT IMPEDANCE 200 ohms SE, 400 ohms balanced. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum).MAXIMUM INPUT 250mV RMS at 1kHz (680 mV RMS at10kHz).RATED OUTPUTS 0.5V RMS 10Hz to 20kHz, 100K ohm load (output capability is 80V RMS BAL output at 1/2% THD at1kHz, 40V SE).POWER SUPPLIESElectronically regulated low and high voltage supplies. Automatic 40 sec. warm-up/brown-out mute. Line regulation better than .01%.NOISE0.22uV equivalent input noise, IHF weighted, shorted(Low Gain) input (73 dB below 1mV 1kHz input). 0.055uV equivalent input noise (High Gain) (65dB below 0.1mV 1kHz input).TUBE COMPLEMENT (8)-6H30P dual triodes, plus (2 each) 6550C and 6H30P in power supply.POWER REQUIREMENTS100-135VAC 60Hz (200-270VAC 50/60Hz) 235 watts maximum. Standby 0.8 watts.DIMENSIONS Width 19” (48 cm); Height 7” (17.8 cm) (standard rack panel).Check out my other listings.Feel free to ask any questions.I ship items only to buyers with signature required on items above $750.NOTE: Returns not accepted.