D250 MkII

About the D250 MkII

The Audio Research D-250 mkII is a flagship stereo tube power amplifier originally launched in the 1980s, known for its robust 240 watts per channel output into 16 ohms and its use of 32 hand-matched tubes including 6550 power tubes and various smaller tubes for input and regulation stages. It features a frequency response of 20Hz to 20kHz (OEM spec), with measured response extending from 12Hz to 64kHz ±3dB, total harmonic distortion of 1%, a damping factor of 20, and a signal-to-noise ratio of 90dB. The amplifier uses a unique 'floating zero' output design for improved push-pull circuit performance. The D-250 mkII includes four built-in fans for cooling and has been extensively restored and tested in some units, with high-end capacitors and matched tubes to ensure optimal performance. It is a large and heavy amplifier, weighing approximately 63 kg, with dimensions around 480 x 270 x 530 mm. The original It does not include remote control functionality. The D-250 mkII is highly regarded for its power, build quality, and sonic performance in the audiophile community.