Sunny Components Inc.
1370 E. Cypress St.
Covina, Ca 91724
Hours: Tuesday - Friday 9-5:30 Saturday 10-4
Audio Research Reference 750 1 pair Mono Block Amplifiers.
1 pair of Amplifiers for sale.
These Amplifiers are our Store Demonstration Models.
They will be sold with Audio Research's warranty.
They will be shipped by freight only
The Reference 750 monoblock amplifiers continue the story began
nearly 20 years ago with the introduction of the Reference 600; that is,
to create an ultimate, tube-driven amplifier with enough power to drive
any speaker load, and provide a musical experience unlike any before
it. The Reference 750 redefines all expectations of what is possible
from an amplifier in a music playback system. It is the culmination of
everything Audio Research knows about amplifier design and manufacture –
High Definition in its purest, most dynamic form.
Listening to Reference 750 monoblocks in a high performance system
is a transformative experience; under total control, speakers disappear
from the listening room and transport the listener into a
three-dimensional realm where music takes on a palpable, tangible form.
Details from source material are resolved against a black background,
painting images in space with vivid reality. Bass becomes the
on which this living performance develops, produced with
startling temporal and timbral accuracy. Here is the breath of the
performer, the pick against the string, the brilliance of a full
The Reference 750 is prepared to deliver 750 watts of
power into speaker loads of 4, 8 and 16 ohms. This is achieved by the
use of a massive, custom- built power transformer delivering current
from sixteen KT120 vacuum tubes. Thanks to extensive testing and strict
selection of tubes, the amplifier requires little maintenance and
obviates the need for costly and sonically deleterious automatic bias
systems. Power supply regulation is also achieved by vacuum tube with a
6550WE and 6H30 driver. The bulk power supply energy storage has been
increased to 1300 joules, a 30% increase over the preceding REF610T.
Tube bias is controlled by two KT120 tubes, each driving a bank of eight
Visually, the Reference 750 is a monolithic tower design,
finished with monochromatic panels for a clean, contemporary
appearance. The front panel displays two analog meters, one for output
wattage and bias, and the other for incoming A.C. line voltage. Four
buttons beneath the top meter control meter brightness, bias power and
fan speed (for the optional ventilated top covers). The back panel has
taps for 4, 8 and 16 ohm loads, as well as a tube hour running time
display. Power connection is via a 20A IEC connector and cable. Each
unit weighs approximately 170 pounds (77 kg).POWER OUTPUT
750 watts per channel continuous from
20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 750
watts, below .04% at 1 watt. Approximate actual power available at
"clipping" 850 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
) 15Hz to 150kHz.FREQUENCY RESPONSE
at 1 watt) 1 Hz to 200 kHz.INPUT SENSITIVITY
4.6V RMS Balanced for rated output. (24 dB gain into 8 ohms.)INPUT IMPEDANCE
200K ohms Balanced.OUTPUT TAPS
4, 8, 16 ohms.OUTPUT REGULATION
Approximately 0.5dB 16 ohm load to open circuit (Damping factor approximately 17).OVERALL NEGATIVE FEEDBACK
20 volts/microsecond.RISE TIME
1.5 microseconds.HUM & NOISE
Less than 0.2mV RMS – 110dB below rated output (IHF-A weighted, input shorted, 16 ohm output).POWER SUPPLY ENERGY STORAGE
Approximately 1300 joules.POWER REQUIREMENTS
105-130VAC 60Hz (260-750VAC 50Hz) 2100 watts at rated output, 2400 watts maximum, 800 watts at "idle".TUBES REQUIRED
8 Matched pair KT120 Power Output; 1 6550WE Regulator; 1 6H30 Regulator Amplifier; 1 matched pair KT120 Driver; 1 6H30 follower.DIMENSIONS
13.5" (34.3 cm) W x 23" (58.4 cm) H x 20.8" (52.8 cm) D. Handles extend 1.5" (3.8 cm) forward and rearward.WEIGHT
170 lbs. (77.2 kg) Net; 395 lbs. (180 kg) per pair shipped weight.
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