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Audio Research LS7 Preamp and D240 Power Amp


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Item: Audio Research LS7 Preamp and D240 Power Amp
Location:Sydney (2127)
Price: 2700
Item Condition:Good condition. 
Reason for selling: Preparation for moving out to QLD. 
Payment Method: Pickup - Cash, Paypal, COD Only
Extra Info:

 

Reluctantly selling a great combo of pre (tube based) and power amp (Solid State). 

Have no user manual and original box.

Bought this in 2010 from a friend who are into high end hifi gears. 

Don't really know how to explain its sound in words.  To me it is very sweet, smooth detail and has  a big soundstage.  It sort of has a holographic sound.  

Excellent build which I think is built to last. 

Price is firm

Will only sell as a combo as I have tried to partner the AR LS7 with Emotiva Amp,  Arcam , Rotel Power Amp powering a Magneplanar 1.7 or Sonus Faber Domus Grand Piano,  it didn't sound better than this combo. 

 

 

I am happy to demo this combo to stereonet members who have good feedbacks or has been a member for at least 1 year.  

Strictly for local pickup only. 

 

 

Audio Research LS7

This is a tube based pre amp. 

 

Frequency response ± .5dB, 1.0Hz to 100kHz -3dB points below 0.1Hz and above 300kHz
Distortion (THD) Less than .01% at 2V RMS output. (Typically .005% in midband)
Noise & hum 15µV RMS maximum IHF weighted noise at main output with gain control minimum (more than 102dB below 2V RMS output)
Gain Main output - 13dB unbalanced
  Tape output - 0dB
Input impedance 100K ohms.
Output impedance 200 ohms main output. Recommended load 60K ohms and 100pF (20K ohms minimum and 1000pF maximum)
Output polarity  
Maximum inputs 20V maximum
Rated outputs 2V RMS 1Hz to 100kHz, all outputs, 60K ohm load (maximum output 25V RMS at 1/2% THD into 100K ohms)
Power supplies Electronically-regulated low and high voltage supplies. Line regulation better than .01%
Tube complement (4) 6922/E88cc dual triode
Power requirements 100-135VAC 60Hz (200-270VAC 50/60Hz) 25 watts minimum
Other Inputs (5): tape, tuner, CD, video, aux
Controls: Gain, input selector
Toggle switches: power/off, mute/operate
Dimensions 19" (48 cm) W x 5 1/4" (13.4 cm) H (standard rack panel) x 10 1/4" (26 cm) D. Handles extend 1 1/2" (3.8 cm) forward of front panel. Rear chassis fittings extend 1/2" (1.3 cm).
Weight 9.8 lbs. (4.5 kg) Net

 

Audio Research D240 Power Amp

 

Power output 120 watts per channel into 8 ohms, 240 watts per channel into 4 ohms
Power bandwidth 8Hz to 60kHz (-3dB points)
Frequency response  
Input sensitivity 1.6V RMS for rated putput (25.8dB gain) unbalanced or balanced
Input impedance 150k ohms normal or invert, 300k ohms balanced differential
Output taps  
Output regulation  
Overall negative feedback 7.7dB
Damping factor 170
Distortion  
Slew rate 50 volts/microsecond
Rise time 1.5 microseconds
Hum & noise 106dB below rated output IHF A-weighted
Power supply energy storage 144,000 µF
Power requirements  
Other Input Polarity: Non-inverting at normal inputs. Balanced pin 2+.
Dimensions 19" W x 5 1/4" H x 11 5/8" D
Weight 38 lbs.

 

 

 


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