Audio Research Reference 2 mkII Stereo Preamplifier in excellent condition

This listing is for a one owner Audio Research Reference Two MKII Stereo Preamplifier in its correct packing with remote, manual and power cord. In excellent condition, no dents or dings.

We also have the VT200MKII tube amp it was used with in separate Audiogon ad.

Not included.

Audio Research’s first 21st-century, audiophile-quality line-stage preamplifier combines retro-tech vacuum-tube amplification and power-supply circuitry with innovative, remote-controlled gain, balance, tape monitoring, and signal routing. The price is also 21st-century: $9995. As in ARC’s Reference phono section, the Reference Two’s pair of vertically mounted circuit boards results in a single, relatively tall chassis.

The fully balanced gain section, rated at 2V RMS balanced (maximum output is 30V RMS) and 1V single-ended, uses six specially selected Sovtek 6H30n-EB super tubes, while the onboard power supply consists of a 5AR4 rectifier tube, with the resultant DC regulated by a 6L6GC and a 6H30n-EB.

In place of traditional mechanical potentiometers or stepped attenuators, the volume and balance controls are spring-loaded on/off switches that control the electronic attenuator’s 125 steps. Turn the volume control quickly in either direction and release, and the level rises or drops by a single step. Hold the switch to the left or right and the gain increases or decreases continually, measured by a succession of LEDs surrounding the gain and balance knobs on the unit’s face. There are far fewer than 125 LEDs around the knobs—the level and balance can be changed by many steps before any change is reflected in the LED display.

Similar spring-loaded electronic switches control the eight selectable inputs and the seven-position tape-monitor facility, giving you the option of listening to one source while taping another. Four toggle switches control power, muting, balanced/single-ended in, and phase. Once configured, a memory feature automatically switches between single-ended and balanced inputs as you switch through the input choices.

The slim, compact remote control duplicates all of the front-panel controls except for the balanced/single-ended switch, which, after the initial input configuration, you won’t need to adjust anyway. With volume and source remote-controllable, the Reference Two is a reviewer’s best friend.

Continuing a long Audio Research tradition, the rear panel’s right-channel row of inputs and outputs is placed above the left-channel row. Don’t ask me why; everyone else does the opposite. Whatever: the chassis-mounted RCA and XLR jacks are generously spaced and easily accessed. In addition, there are two sets of Main outs, a Record out, and an IEC mains jack.

Everything about the solidly built Reference Two has been designed for the convenience of the well-heeled audiophile able to buy such an expensive product—everything but the 16 screws he or she will have to remove to get to the circuit boards and install the tubes. Hopefully that inconvenience won’t have to be repeated for many years! While ARC thoughtfully provides a high-quality screwdriver, I was happy to have a a powered screwdriver (set to minimum torque) for the task.

Operation and Sound
The Reference Two is not intended to be left on continually, but about an hour’s warmup time is needed before it’s ready to give you all the music it’s got. If you buy one and want to listen after a hard day at the office, switch it on before dinner—though it will play after about 45 seconds.

The remote is a pleasure to use, and, with its phase-inversion and input-selection capabilities, offers genuine 21st-century convenience. Thankfully, AR chose not to adapt a cheap, plastic mid-fi remote—an insult to the purchaser of a $10,000 preamp—nor did it encase the remote in a weighty, unwieldy aluminum sarcophagus. The Ref 2’s remote is lightweight, unobtrusive, and won’t tire your wrist muscles.

Remote-controlled, fully balanced, vacuum-tube preamplifier.

Tube complement: six 6H30n-EB super tubes; one each 5AR4, 6L6GC

Voltage Gain: 18dB balanced, 12dB single-ended.

Frequency response: 0.5Hz-60kHz, +0/-3dB at rated output.

Hum and noise: 20µV RMS residual IHF-weighted noise output with gain control set to its minimum (100dB below 2V RMS balanced output, 97dB below 1V RMS SE output).

Distortion: <0.015% at 2V RMS balanced output.

Output impedance: 400 ohms balanced, 200 ohms single-ended.

Recommended load: 20k ohms minimum resistance and 2nF maximum capacitance.

Input impedance: 132k ohms balanced, 66k ohms single-ended.

Dimensions: 19" W by 7" H by 15.5" D. Weight: 31 lbs.

Orig MSRP $9995. Offered for $3500.00 plus $150 shipping.