Audio Research Reference 750SE Mono Power Amps: Excellent Trade-In; acX Wrnty; 67% Off

Audio Research Reference 750SE Mono Power Amplifiers: Excellent Condition Trade-In; 90 Day acX Warranty; 67% Off

MSRP: $74,999.95 USD/Pair

acX Price: $24,499.95 USD/Pair - 67% Off

The Reference 750 SE 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 KT150 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 6550WE and 6H30 vacuum tubes. Tube bias is controlled by two KT150 tubes, each driving a bank of eight tubes.

Specifications:
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 Taps: 4, 8, 16 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 (200-270VAC 50Hz) 2100 watts at rated output, 2400 watts maximum, 800 watts at “idle”. Tubes Required: 8 Matched pair KT150 Power Output; 1 6550WE Regulator; 1 6H30 Regulator Amplifier; 1 matched pair KT150 Driver; 1 6H30 follower.