Audio Research M100 Monobloc Tube Amplifier Pair

Audio Research M100 tube amps, rated at 100 watts continuous

MSRP

MSRP was $4990 / pair

Asking $3990 / pair , OBO

Ave. selling price on Audiogon bluebook is $2189 /ea.

We have for sale: A vintage pair of The Audio Research M100 tube amps which are rated at 100 watts continuous.  We would like to sell them matched with the Audio Research SP-11 preamp that we also took in on trade.

We listened to them in our showroom with the legendary Audio Research SP-11 hybrid tube/FET 2 piece preamp (which came with the M-100’s from a customer trade-in), and connected them to Wilson Audio Sabrina X’s, and they have robust bass performance, deep soundstaging, excellent imaging, and dynamics that draws the listener close to the live music reference. 

SEE PHOTO GALLERY BELOW.

These amps have speaker taps for 4, 8, 16 ohms. They are full vacuum tube amps NOT hybrids. Each amp contains 5  6550 tubes, 1 12AT7 tube, 2 6DJ8 tubes and 5 7044 tubes. Both amps are in excellent condition both electrically and cosmetically. Included are the original factory shipping boxes, (though a little crusty if you will) We have a PDF digital owners manual and PDF Schematic guide. We are selling them AS IS with No warranty. 

They can be picked up in our showroom in Melbourne, Florida.

Details:

TYPE
Tube mono amplifier
INTRODUCED
1984
MSRP (US NEW RETAIL)
$4,990/pair

Specifications:

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
FREQUENCY RESPONSE
–
INPUT SENSITIVITY
0.7V RMS for rated output

INPUT IMPEDANCE
65K ohms, nominal
OUTPUT TAPS
–
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