With Perhaps no introduction needed, we're thrilled to present the Audio Research D-250, one of the most widely-praised power amplifiers of all time. The D-250 is a commanding presence. The amplifier is huge, with most of its 138-lb weight coming from massive power and output transformers. With thirty-two hand-matched tubes, delivering a hefty 250 watts of stereo power, this amp was in a class all its own when launched in 1983. Indeed, there are few analogs to this day. Naturally, a component of this caliber deserves the very best, so in addition to a meticulous service and cleaning, our chief engineer put it through a 40-hour critical listening test, and has given this unit the highest marks for musicality.
- Production
- 1983
- Condition
- 9/10
- Serial No.
- 54230006
- Orig. MSRP
- $4995
- Restoration
- Full 30-point service check
- 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 chassis
- 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).
- Packing
- We'll deliver this piece in its original factory box, so you can be sure it will be protected just as Audio Research intended.
- Shipping
- This piece ships to the contiguous United States for a flat rate of $380, which includes our packaging and our insurance. Of course, we'll ship anywhere in the world, just drop us a line and we'll give you an estimate – even if you're just curious.
- Stock No.
- 7872506724573
With Perhaps no introduction needed, we're thrilled to present the Audio Research D-250, one of the most widely-praised power amplifiers of all time. The D-250 is a commanding presence. The amplifier is huge, with most of its 138-lb weight coming from massive power and output transformers. With thirty-two hand-matched tubes, delivering a hefty 250 watts of stereo power, this amp was in a class all its own when launched in 1983. Indeed, there are few analogs to this day. Naturally, a component of this caliber deserves the very best, so in addition to a meticulous service and cleaning, our chief engineer put it through a 40-hour critical listening test, and has given this unit the highest marks for musicality.
Production
1983
Condition
9/10
Serial No.
54230006
Orig. MSRP
$4995
Restoration
- Full 30-point service check
- 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 chassis
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).
Packing
We'll deliver this piece in its original factory box, so you can be sure it will be protected just as Audio Research intended.
Shipping
This piece ships to the contiguous United States for a flat rate of $380, which includes our packaging and our insurance. Of course, we'll ship anywhere in the world, just drop us a line and we'll give you an estimate – even if you're just curious.
Stock No.
7872506724573
