Audio Research Reference 750 Mono Blocks Beautiful Condition

Rare opportunity to own without a doubt one of the finest current production vacuum tube mono block amplifiers available today.  Audio Research manufacture and hand craft the 750 Reference mono blocks individually, on a one at a time basis in their Minnesota facility.  These amplifiers were originally purchased brand new, with single owner history and used sparingly in a spotless, non-smoking private home within a dedicated 2-channel stereo listening room.  Low hours of use, under 2000 hours, includes all factory supplied vacuum tubes for both right and left channels, original power cords, factory certificate of ownership with serial numbers, registration information and accessories.  Amplifiers age estimate one year and a few months old.  Serial numbers #83306301 and #83306302 - Voltage 120v/60Hz. 

Please refer to photographs for actual physical condition, the amplifiers are in near mint condition overall and rate easily a 9/10 condition, however, there is one small, superficial scratch on the rear of one of the mono blocks hence the conservative 8/10. 

We will NOT take any chances in delivering these precious hand made Audio Research mono block amplifiers without building custom matched wood shipping crates which will be supplied to the respective buyer upon receipt of payment and prior to delivery.  Please call me or email directly for prompt discounted domestic and international overseas freight quotes.

Chicagoland pickup welcome, please call me directly at 219.933.8115 to make arrangements.  Will drive to meet buyer within a reasonable distance. 

Bank Wire, Cashiers Check, Personal Check and Credit Cards accepted. 

Serious individuals and private parties please contact Christopher Thornton directly at [email protected] or call 219.933.8115.

Please contact me directly for sales negotiations, do not use the Audiogon member messaging system to communicate to us.  We pay premium commercial listing fees so that prospective parties can contact us privately.

Thank you. 

Sincerely,
Christopher Thornton
Artisan Fidelity
www.artisanfidelity.com
[email protected]
219.933.8115

Audio Research Reference 750 Stereo Power Amplifier:


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:

(-3dB points) 15Hz to 150kHz.

FREQUENCY RESPONSE:

(-3dB points 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 POLARITY:


Non-inverting. Balanced input pin 2+ (IEC-268).


OUTPUT TAPS:


16 ohms, 8 ohms, 4 ohms.


OUTPUT REGULATION:

Approximately 0.5dB 16 ohm load to open circuit (Damping factor approximately 17.

OVERALL NEGATIVE FEEDBACK
13dB

SLEW RATE:

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.