audio research
D-40

Description
Tube stereo power amplifier.

Introduced
1981

Discontinued
?

Revisions
-

Options
-

MSRP (US new retail)
$1,595

Specifications

Power output 35 watts per channel minimum continuous (both channels operating) at 16 ohms from 25Hz to 20kHz with less than 1% total harmonic distortion.
Typically approximately .06% at 30 watts @lkHz.
Approximate actual power available per channel at "clipping" (Both CH. OP, 1kHz): 42 Watts
Power bandwidth (-3dB points) 12Hz to 54kHz
Frequency response  
Input sensitivity .75V RMS for rated output
Input impedance 75K ohms, nominal at maximum gain
Output taps  
Output regulation Approximately .6dB, 16 ohm load to open circuit
Overall negative feedback 19. 5dB
Damping factor Approximately 15
Distortion Intermodulation distortion: Less than .5% at 1dB below rated output (64V p to p, 16 ohms) (SMPTE method)
Slew rate 8 V/µs
Rise time 5 µs
Hum & noise 1Hz-30kHz, unweighted, rnore than 90dB below rated output.
Line components, more than 85dB below rated output.
Power supply energy storage 100 joules
Power requirements 105-125VAC 60Hz (210-250VAC 50Hz) 300 watts maximum.
150 watts at "idle".
230 watts at rated power.
Tube complement (4)12AX7, (2) 6FQ7, (2 matched pairs) 5881, (1) 12AT7, (1) 12BH7
Other  
Dimensions 19" (48cm) W (standard rack panel) x 7" (18 cm) H x 16.5" (42 cm) D (front panel back). Handles extend 1 5/8" (4.1 cm) forward of front panel
Weight 44 lbs. (20 kg) Net, 56 lbs. (25.5 kg) Shipping

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