audio research
D-70

Description
Tube stereo power amplifier.

Introduced
1983

Discontinued
?

Revisions
D-70 MKII (1984)

Options
-

MSRP (US new retail)
$1,995

Specifications

Power output 60 Watts per channel minimum continous (both channels operating) at 16 ohms from 20Hz to 20kHz with less that 1% total harmonic distortion (typically below .005% at one watt)
Power bandwidth 15 Hz. to 30 Khz (-3 dB points) (D-70 MKII)
Frequency response  
Input sensitivity  
Input impedance  
Output taps  
Output regulation  
Overall negative feedback 20.5 dB (D-70 MKII)
Damping factor 15 (D-70 MKII)
Distortion Harmonic Distortion: Less than 1% (typically less than .005% @1W) (D-70 MKII)
Slew rate 10 V/µs (D-70 MKII)
Rise time  
Hum & noise  
Power supply energy storage 140 joules
Power requirements  
Tube complement D-70: (7) 6922, (2 matched pairs) 6550, (1) 6550, (1)12AX7
  D-70 MKII: (3) 6922, (4) 6FQ7, (2 matched pairs) 6550, (1) 6550, (1) 12AX7
Other  
Dimensions 19" W x 7" H x 16.5" D
Weight 49 lbs. Net, 63 lbs. Shipping

Reviews

Pictures

D-70:

D-70 MKII: