audio research
D125

Description
Hybrid tube/FET stereo power amplifier.

Features include: Servo for auto balance of plate currents between output tube push & pull pairs; Front panel LED indicators and adjustment controls for left and right channel output tube plate current; Low current LED indicator for each output tube viewable through cover; "Tube Saver" circuit to protect output tubes from abnormal conditions or input overloads (eg. DC); Twin subsonic cooling fans for temperature control and increased life of output tubes.

Introduced
1988

Discontinued
1991

Revisions
-

Options
-

MSRP (US new retail)
$4,395

Specifications

Power output 110 Watts per channel
Power bandwidth 10 Hz to 80 KHz (-3 dB points)
Frequency response  
Input sensitivity 0.7 Volts for rated output
Input impedance 100K ohms
Output taps 4, 8 and 16 ohms
Output regulation Approximately 0.4 dB 16 ohm load to open circuit
Overall negative feedback 21 dB
Damping factor 20
Distortion Less than 0.4% total harmonic distortion at 110 watts (typically below .005% at 1 watt)
Slew rate 20 Volts/µs
Rise time 3 µs
Hum & noise 90 dB below rated output
Power supply energy storage 280 joules
Power requirements  
Tube complement (4 matched pairs) 6550
Other  
Dimensions 19" W x 8 3/4" H x 16.5" D
Weight 84 lbs. Net, 95 lbs. Shipping

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