D-80 Tube Power Amplifier By Audio Research (Demo)
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Product Summary:
The D-80 tube amplifier combines rich musicality, balanced KT150-powered performance, immersive sound staging, and automatic bias control in a refined high-end design optimized for discerning audiophiles and balanced audio systems.
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NA
Countries Shipped
USA
Burn-In Time
NA
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Amplifiers, Audio Research, Deals, Tube Amplifiers
D-80 Tube Power Amplifier By Audio Research (Demo)
Original price was: $12,950.$0Current price is: $0.
The D-80 tube amplifier combines rich musicality, balanced KT150-powered performance, immersive sound staging, and automatic bias control in a refined high-end design optimized for discerning audiophiles and balanced audio systems.
Click To Read MoreProduct Description
Purchase Date: May 2026
Color: Silver
Condition: As-new, with no marks, scuffs, or visible signs of wear. Very low hours, approximately 300hrs of use. Includes all original packaging.
Shipping/Insurance: Included
Warranty: Full Manufacturer’s Warranty
Note: This amp just arrived and has served as our listening space reference. We liked it so much we’re upgrading to the Audio Research Ref 80X as soon as it starts shipping.
The D-80 tube amplifier delivers a rich, expansive tonal character with impressive resolution and musical authority, wrapped in a refined design inspired by premium reference-level tube amplification.
Consider the D-80 as a less expensive and streamlined version of the Reference S-80… the same amplifier, without the front-panel meter display, single-ended triode output mode, or RCA input jacks (balanced/XLR only).
Building on the legacy of the iconic “D” series amplifiers that helped define high-performance audio, the D-80 carries forward a tradition of exceptional sound quality, dynamic presence, and timeless engineering.
Drawing heavily from the acclaimed Reference 80S stereo tube amplifier platform, the D-80 features a fully balanced differential signal path with a pair of KT150 output tubes per channel. Carefully selected internal components contribute to excellent tonal depth, controlled bass response, and a spacious, immersive soundstage — all in a more accessible configuration.
The D-80 utilizes a full pentode design and is optimized for balanced audio systems, featuring balanced XLR inputs for seamless integration with high-end preamplifiers. Multiple 4-, 8-, and 16-ohm speaker taps provide flexible loudspeaker matching, while the fully balanced output stage drives both speaker terminals for enhanced performance.
An advanced auto-bias system continuously adjusts output tube bias in real time, compensating for tube aging and fluctuations in line voltage to help maintain consistent sonic performance over time.
Each unit is precision-built, thoroughly tested, and individually auditioned to ensure exceptional quality and listening performance.
Reviews
Architeg
“The 80 watts per channel specification might sound technical, but what it translates to is an amplifier that can effortlessly drive a wide range of speakers, filling any room with immersive sound. You’re not just hearing music—you’re feeling it.”
Home Theater HiFi
“Find an Audio Research dealer and listen to this amplifier. Given its extremely high-quality construction, amazing sound, and consistently high resale value, you might just change your mind. Before you spend any fraction approaching 50% of the price of this amplifier, you owe it to yourself to at least hear the Audio Research VT80 tube amp. It’s that good.”
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Specifications
- Power Output:
- Power Output: 70 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% at 140 watts, below 0.04% at 1 watt. (Note that actual power output is dependent upon both line voltage and “condition” i.e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not critical)
- Power Bandwidth: (-3dB points) 7Hz to 68kHz
- Frequency Response: (-3dB points at 1 watt) 0.7Hz to 94kHz
- Input Sensitivity: 1.4V RMS Balanced for rated output. (25.5 dB gain into 8 ohms). RMS SE for rated output.
- Input Impedance: 300K ohms Balanced (75K ohms SE)
- Output Polarity: Non-inverting. Balanced input pin 2+ (IEC-268)
- Output Taps: 4, 8, 16 ohms
- Output Regulation: Approximately 1.0dB 16 Ohm Load to Open Circuit (Damping factor approximately 8)
- Overall Negative Feedback: 15dB
- Slew Rate: 10 volts/microsecond
- Rise Time: 4.0 microseconds
- Power Requirements: 105-130VAC 60Hz (210-250VAC 50Hz) 420 watts at rated output. 221 watts at “idle”, 3.6 watts off Units for Japan: 100VAC 50/60Hz
- Tubes Required: 2 matched pair KT150 (Power output V1-V4); 2 6H30 (Gain stage V5, V6)
- Dimensions:
- Width 18.5” (47 cm) chassis; 19.0” (48.26 cm) faceplate
- Height 10.5” (26 cm)
- Depth 18.5” (47 cm)
- With handles & connectors: 21” (53.3 cm)
- Weight:
- 62 lbs. (28.2 kg) Net
- 73 lbs. (32.7 kg) Shipping
Know more details about products
Product Description
Class A Single-ended, transformer-coupled, balanced amplifier, powered by the legendary 300B tubes
- Engineered to power even the most demanding headphones, delivering up to 8 Watts of high-quality audio performance.
- Features a distinctive finish and a wide range of customization options to suit your unique style.
- Offers a variety of inputs and outputs, providing maximum flexibility and functionality for all your audio needs.
- Equipped with balanced XLR input and output connections for superior sound quality and enhanced signal integrity.
Standard Edition includes :
- 300B power tubes
- Premium copper signal wiring
Performance Edition includes :
- Full Music 300B power tubes
- UPOCC (single crystal copper) signal wiring
Reviews
Stereophile
“It looks like it was designed to sit on a smart person’s desk, beckoning constantly to be used. With every headphone I tried, it performed as though it had been engineered to present recordings in the most vivid manner possible, be 100% musically satisfying, and be the last headphone amplifier any of us might need to own. “
https://www.stereophile.com/content/gramophone-dreams-81-feliks-envy-headphone-amplifier
Headfonia
“It’s always fun reviewing high end gear. The Feliks Audio Envy 300B tube amplifier is among the best on the market. It’s a truly high-end amplifier with an incredible sound. It costs a pretty penny but if you have the budget you will never ever need a different tube headphone amp.
The Feliks Audio Envy is a future classic already. If you have the chance listen to it, you absolutely should. And sorry about your wallet, because you’ll want one once you’ve heard what it is capable off.”
https://www.headfonia.com/feliks-audio-envy-review/4/
Hifipig
“The Feliks Audio Envy Performance Edition is a true high-end headphone amplifier, it is also an end-game amplifier for many of those who choose to purchase one.
It has all the qualities many will want in this segment of the market – exceptional power output for even the hardest-to-drive headphones paired with stunning build quality.
The sound quality doesn’t let it down and it is versatile and works with a plethora of headphones whilst outputting a dynamic, rich, and effortless sound that has excellent detail and just the right amount of valve magic.”
https://www.hifipig.com/feliks-audio-envy-performance-edition-300b-set-headphone-amp/
Specification
- Power tubes: 300B
- Driver tubes: PsVane CV-181 mk2 (6SN7)
- 2x unbalanced RCA inputs (IN1, IN2)
- 1x balanced XLR input (IN3)
- Input sensitivity 1V RMS
- Input impedance:
– For IN1 i IN2 (RCA) 100k?
– For IN3 (XLR) 10k? - 1x pair of pre-amplifier output as RCA
- 1x pair of pre-amplifier output as XLR
Maximum voltage on the above outputs is 5V (RMS) at output impedance of 600? and THD<0,5%
- Impedance selector guidance:
– LO – up to 60?
– MID – up to 300?
– HI – up to 600?–mnh
- Amplifier’s impedance:
– LO at 32? load is 3,8?
– MID at 100? load is 8,8?
– HI at 600? is 20?
Output powered measured at MID impedance setting at load of 16? is 5W with THD ?1% (maximum 8W at THD >5%)
- Frequency response:
– 8Hz÷100kHz ±3dB
– 18Hz÷40kHz ±1dB - Headphone outputs: 6.3mm and XLR
- AC voltage 50/60Hz:
– 230V version (±5%)
– 115V version (±5%) - Power consumption: 110VA
- Weight: 15,1kg (without packaging)
- Dimensions:
– 35x33x18,5cm (LxWxH) – without tubes
– 35x33x24,5cm (LxWxH) – with tubes
Box Content
- Matched pair of driver tubes CV-181(6SN7)
- Matched pair of power tubes 300B
- AC cord
- User Manual
- Warranty Card
Additional information
- Weight: 15,1 kg
- Dimensions: 35 × 33 × 18,5 cm
- Upgrade Options: Standard, Performance (+800€)
- AC Voltage: 230V, 120V
Reviews
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