Audio Research - D240 Solid state power amplifier

The Audio Research D240 MkI is a solid-state stereo power amplifier manufactured in the early 1990s, highly regarded for blending part of Audio Research's characteristic musicality with the reliability of a fully transistorized stage.

Key features:
Type: Solid-state stereo power amplifier.
Manufacturing period: Approximately 1990-1992.
Output power: 120 W per channel at 8 Ω in stereo.
Minimum recommended load impedance: 4 Ω.
Frequency response: 20 Hz - 20 kHz.
Damping factor: 170.
Gain: 25.8 dB.
Input sensitivity: 1.6 V.
Signal-to-noise ratio: 106 dB.
Weight: 17.3 kg.
Dimensions: 480 × 133 × 295 mm.
Technical design
Input stage based on selected J-FET and MOS-FET.
Direct-coupled output stage with multiple high-current transistors per channel.
Electronically regulated power supply.
Energy storage capacity of approximately 180 joules.
Electronic protection against short circuits, overloads, and presence of DC at the output, with no fuses in the signal path.

Connections:
Unbalanced RCA inputs.
Inverted RCA inputs for balanced operation.
XLR balanced inputs.
Can operate in stereo or bridged mode.

Sound:
The D240 MkI is often described as one of Audio Research's most "tube-like" solid-state amplifiers of its era:

Warm and fluid sound.
Wide and deep soundstage.
Very natural mids.
Controlled bass.