The Audio Research M-100 is a monoblock tube amplifier that captures the essence of classic tube warmth and power while maintaining the precision and authority that Audio Research has become famous for. Released in the 1980s, the M-100 is a powerhouse, delivering 100 watts of pure tube-driven output per channel. Designed for audiophiles who crave the combination of musicality and dynamic range that only a well-executed tube amplifier can deliver, the M-100 stands as one of the more iconic amplifiers from the golden era of high-end audio.
Production
1984
Condition
9/10
Serial No.
46133009 / 76033019
Orig. MSRP
$4990
Restoration
- Tested power: 99.7 Watts RMS into 8 ohms @ 0.9% THD+N
- Replaced missing tube cage screws
- Adjusted bias
- Cleaned unit
Factory Specs
Power output
100 watts minimum continuous at 16 ohms from 20Hz to 20kHz with less than 1% total harmonic distortion (typically below .005% at 1 watt). Approximate actual power available at "clipping"; 115 watts (1kHz). (Note that actual RMS 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) 12Hz to 60kHz
Input sensitivity
0.7V RMS for rated output
Input impedance
65K ohms, nominal
Output regulation
Approximately .4dB, 16 ohm load to open circuit
Overall negative feedback
19dB
Damping factor
Approximately 20
Distortion
Intermodulation distortion: Less than .2% at 1dB below rated output (100V P to P, 16 ohms - SMPTE method)
Slew rate
15 V/µs
Rise time
5 µs
Hum & noise
Less than 2mV RMS 90dB below rated output (broad-bandwidth unweighted, inputs shorted)
Power supply energy storage
Approximately 280 joules
Power requirements
105-125VAC 60Hz (210-240VAC 50Hz) 800 watts maximum. 300 watts at "idle" - 400 watts at rated output power
Tube complement
(2 matched pairs) 6550 power output, (1) 6550 regulator, (1) 12AT7/ECC81 regulator amplifier, (2) 6DJ8/ECC88 phase inverter, input amplifier, (4) 7044 cross-coupler, driver, output couplers, (1) 7044 regulator
Dimensions
19" (48 cm) W (standard rack panel) x 7" (18 cm) H x 16½" (42 cm) D (front panel back). Handles extend 1 ⅝" (4.1 cm) forward of the front panel. Output connector extends 1" behind rear panel.
Weight
53 lbs. (24 kg) Net; 69 lbs. (31 kg) Shipping
The History of Audio Research
Audio Research Corporation, affectionately known to fans as ARC, was founded by William Z. Johnson, who began designing custom audio electronics in the early 1950’s and who also operated a specialty audio retail store until the mid-1960’s. Johnson’s efforts almost single-handedly revived vacuum-tube designs at a time...
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Liner Notes
At last: A "User Friendly" vacuum tube power amplifier.
This 100-watt monaural amplifier was designed to provide those seeking the musical satisfaction of state-of-the-art vacuum tube amplification a format that would not require "tweaking" to obtain the desired results. Its direct and cross-coupled (patented Audio Research Corporation circuitry) amplification employs an automatic "servo" circuit, so that the DC balance (necessary for peak performance) is always automatically maintained, even through vacuum tube changes.
Output tube bias is not only electronically regulated, but is also front panel adjustable-with indicators-thus completely eliminating uncertainty regarding output tube condition adjustment.
Offered in the monaural format to fully optimize performance, the M100 was designed for state-of-the-art systems where its power will be sufficient. We believe the M100 will sonically satisfy the most demanding music lover.
Stock No.
8817973100765
