Condition
9/10
Serial No.
54230006
Orig. MSRP
$4,995
Restoration
- Comprehensive bench test
- Tested original caps for ESR, replaced any in question
- Recapped signal path with high end Jantzen capacitors (>$600)
- Installed high end power supply capacitors
- Replaced all out-of-spec resistors or power supply transistors
- Inspected and tested all tubes (none over 150 hours of operation)
- Hand-selected 3 new tubes to match gain of originals
- Balanced all tubes
- Cleaned controls, switches, and internal electronics
- Exterior detailed
Factory Specs
Type Tube stereo power amplifier
Power output 240 watts per channel into 16Ω (stereo)
Number of Channels 2
Frequency response 20Hz - 20kHz (OEM spec)
Measured Frequency response 12Hz to 64kHz ±3dB (continuous output)
Rise Time 29 v/μs (beyond OEM spec)
Total harmonic distortion 1%
Damping factor 20
Input sensitivity 0.8V
Signal to noise ratio 90dB
Remote Control no
Tube Complement (32 total) 16x 6550 (power output / Sovtek / low gas), 4x 6550 (regulator / Sovtek / low gas), 2x 12AT7 (regulator driver), 4x 6DJ8 (small signal), 4x 7044 (small signal), 2x 6FQ7 (driver)
Dimensions 19"W x 10.5"H x 20.75"D
Weight 138 lbs.
Documentation
ARC D250 Owner's Manual
The History of Audio Research
Audio Research Corporation, affectionately known to fans as ARC, was founded by William Z. Johnson, who began designing custom audio electronics in the early 1950’s and who also operated a specialty audio retail store until the mid-1960’s. Johnson’s efforts almost single-handedly revived vacuum-tube designs at a time...
[ Read More ]
Liner Notes
As you might expect from its power rating, the D-250MKIIS is not small; it is not the power amplifier for an audiophile without strong friends. It also is not simply a tube amplifier, it is a 32 -tube amplifier. The D-250MKIIS uses 16 6550s for amplification, four 6550s for electronic regulation, and 12 smaller tubes for the input amp (6DJ8), cross coupler (7044), driver amp (6DJ8), driver cathode follower (7044), and regulator drivers (12AT7).
Stock No.
7872506724573
