The Audio Research Dual 75 is a vintage tube amplifier that holds a revered place in the history of high-end audio. Introduced in the early 1970s, the Dual 75 was one of Audio Research's landmark designs, showcasing the company's innovative approach to blending tube warmth with modern clarity and control. It’s a 75-watt-per-channel stereo power amplifier, designed to bring dynamic, transparent, and lifelike sound to audiophiles looking to elevate their systems.
Even decades after its release, the Dual 75 remains a benchmark for those who appreciate the emotional depth of tube amplification paired with high fidelity performance. Its robust build quality and timeless sound have earned it a dedicated following among collectors and enthusiasts.
- Production
- 1971-72
- Condition
- 9/10
- Serial No.
- 271111-7
- Orig. MSRP
- $975
- Restoration
- Replaced 6550 output tubes in left channel
- Burnished internal switches for bias jacks
- Cleaned control contacts
- Adjusted bias
- Verified power and distortion Both channels 75 watts per channel RMS into 8 ohms @ less than 1% THD
- Replaced all electrolytic capacitors
- Factory Specs
Power output 75 watts per channel into 8Ω (stereo)
Frequency response 15Hz to 30kHz
Total harmonic distortion 1%
Damping factor 14
Input sensitivity 1.5V
Signal to noise ratio 80dB
Speaker load impedance 4Ω to 16Ω
Valve complement 4 x 12AX7, 8 x 6FQ7, 2 x 6550, 1 x 5881
Dimensions 19 x 7 x 12.25 inches
Weight 52lbs
- Documentation
Audio Research Dual 75 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...
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- Liner Notes
- The DUAL 75 Amplifier is a basic power amplifier of near-military construction aimed at advancing the art of music reproduction. Its dynamic characteristics are without equal when used with commensurate associated equipment.
- Packing
- Prepare to be impressed. We have arguably the best packing process around. We use our InstaPak machine and white open cell foam to build a custom enclosure for your piece that ensures that it's stable and secure. If it is particularly fragile or heavy, we typically opt for private courier delivery. Depending on where you are in the country, that may cost a bit extra. We also take great care to protect the tubes. When sensible, we will pack the tubes to prevent any movement. Other times, we'll individually wrap the tubes and mark their corresponding socket to preserve the bias. You can be confident that your piece will be snug as a bug in a rug.
- Shipping
- This piece ships to the contiguous United States for a flat rate of $175, 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.
- 8858363429085
The Audio Research Dual 75 is a vintage tube amplifier that holds a revered place in the history of high-end audio. Introduced in the early 1970s, the Dual 75 was one of Audio Research's landmark designs, showcasing the company's innovative approach to blending tube warmth with modern clarity and control. It’s a 75-watt-per-channel stereo power amplifier, designed to bring dynamic, transparent, and lifelike sound to audiophiles looking to elevate their systems.
Even decades after its release, the Dual 75 remains a benchmark for those who appreciate the emotional depth of tube amplification paired with high fidelity performance. Its robust build quality and timeless sound have earned it a dedicated following among collectors and enthusiasts.
Production
1971-72
Condition
9/10
Serial No.
271111-7
Orig. MSRP
$975
Restoration
- Replaced 6550 output tubes in left channel
- Burnished internal switches for bias jacks
- Cleaned control contacts
- Adjusted bias
- Verified power and distortion Both channels 75 watts per channel RMS into 8 ohms @ less than 1% THD
- Replaced all electrolytic capacitors
Factory Specs
Power output 75 watts per channel into 8Ω (stereo)
Frequency response 15Hz to 30kHz
Total harmonic distortion 1%
Damping factor 14
Input sensitivity 1.5V
Signal to noise ratio 80dB
Speaker load impedance 4Ω to 16Ω
Valve complement 4 x 12AX7, 8 x 6FQ7, 2 x 6550, 1 x 5881
Dimensions 19 x 7 x 12.25 inches
Weight 52lbs
Documentation
Audio Research Dual 75 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
The DUAL 75 Amplifier is a basic power amplifier of near-military construction aimed at advancing the art of music reproduction. Its dynamic characteristics are without equal when used with commensurate associated equipment.
Packing
Prepare to be impressed. We have arguably the best packing process around. We use our InstaPak machine and white open cell foam to build a custom enclosure for your piece that ensures that it's stable and secure. If it is particularly fragile or heavy, we typically opt for private courier delivery. Depending on where you are in the country, that may cost a bit extra. We also take great care to protect the tubes. When sensible, we will pack the tubes to prevent any movement. Other times, we'll individually wrap the tubes and mark their corresponding socket to preserve the bias. You can be confident that your piece will be snug as a bug in a rug.
Shipping
This piece ships to the contiguous United States for a flat rate of $175, 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.
8858363429085
