Audio Research Reference 210 monoblocks




When you are looking for world class high powered tube amps, there are only so many worthy contenders. The Audio Research Reference 210 is up there with the very best.  At almost a third of its original MSRP, the Reference 210 is a serious bargain.

So how does it sound ? It has a very smooth effortless sound that just allows the music to flow through your system, yet massive power to control even the most demanding speakers.

There is no harshness of any kind, they just bring forth the airiness of valves and control of a solid state beast. There is no need for speaker matching with these amplifiers, their design overcomes any “difficult” load and keeps the control.  Although one would associate them immediately with big floor-standers they will happily drive the elite bookshelf speakers out there.

These mono-blocks have new KT120 valves with less than 200 hours on them.



Power output:  210 watts per channel continuous from 20Hz to 20kHz.
1kHz total harmonic distortion typically 0.5%at 210 watts, below .02% at 1 watt.
Approximate actual power available at “clipping” 240 watts(1kHz).
(Note that actual power output is dependent upon both line voltage and “condition” i.e.
: if power line has high distortion, maximum power will be affected adversely, although
from a listening standpoint this is not very critical.)
Power bandwidth :(-3dB points) 10Hz to 150kHz.
Frequency response:(-3dB points at 1 watt) 0.5Hz to 240 kHz.
Input sensitivity:  1.7V RMS Balanced for rated output. (27 dB gain into 8 ohms.)
Input impedance: 200K ohms Balanced.
Output taps: 4, 8,16 ohms.
Output regulation:Approximately 0.6dB 16 ohm load to open circuit (Damping factor approximately 14).
Overall negative feedback:12dB.
Slew rate:40 volts/microsecond.
Rise time:1.2 microseconds.
Hum&noise:Less than 0.3mV RMS –106dB below rated output (IHF-A weighted, input shorted, 16 ohm output).
Power supply energy storage: Approximately 787joules.
Power requirements:105-130VAC 60Hz (260-250VAC 50Hz) 680 watts at rated output, 950 watts maximum, 380watts at “idle ,”.15 watts off.
Tubes required:3–Matched pair 6550C (Power output V1-6); 1–Matched pair 6550C (Driver V8-9);2–6N1P
(Gain stage V7 and Regulator Driver V10);16550C (RegulatorV11).
Dimensions :19″ (48.3 cm) W x 8.75″ (22.2 cm) H x 19.5″ (49.5 cm) D. Handles extend 1.5″ (3.8 cm) forward.
Weight:  74 lbs. (33.6 kg) Net; 89 lbs. (40.4 kg)Shipping