Reference 80S Tube Power Amplifier By Audio Research

The Audio Research Reference 80S stereo amplifier is designed for listeners seeking high-end vacuum tube performance in a refined and compact form. Engineered with two KT150 output tubes per channel, it delivers powerful, musical sound with the detail, dynamics, and tonal richness expected from Reference-series amplification.

Built around a fully balanced differential design, the Reference 80S is crafted to provide exceptionally low distortion and outstanding sonic accuracy. Its advanced four-layer circuit board layout helps reduce noise while improving overall signal integrity for a cleaner, more immersive listening experience.

The amplifier presents music with remarkable clarity and depth, revealing subtle details, natural harmonics, controlled bass response, and expansive dynamic range. Its quiet background and spacious soundstage help recreate the atmosphere and emotion of live performances with impressive realism.

Sharing the elegant chassis dimensions of the Reference 160 series, the 80S combines sophisticated aesthetics with practical versatility. Features include balanced XLR and single-ended inputs, selectable 4/8/16-ohm output taps, RS232 connectivity, 12V trigger input/output, adjustable fan settings, tube hour monitoring, and an optional auto-off function.

Additional technologies include a proprietary auto-bias system that automatically compensates for tube aging and power fluctuations, along with output tube protection circuitry for enhanced reliability. Users can also select between Triode and Pentode operating modes to tailor performance according to speaker matching and personal listening preferences.

Hand-assembled in the USA, the Reference 80S is designed to pair seamlessly with a wide range of premium loudspeakers, delivering a captivating and highly engaging music experience for discerning audiophiles.

HiFi Choice
“it’ll have to remain a dream to aim towards. Regardless, there’s no disputing that the way the Reference 80S delivers the sort of precision that’s more commonly the realm of solid-state rivals from glass tubes is nothing short of miraculous.”

https://www.hifichoice.com/content/audio-research-reference-80s

HiFi News
“If Audio Research’s first act of freedom was to embrace the ‘everyday’ audiophile then the forthcoming I-series looks to be just the ticket, just as this REF80S is surely the most accessible and compelling gateway to its top-tier Reference range yet offered. It’s hardly beer-budget stuff but the fiscal strain will likely prove secondary to the emotional wrench if you hear this amp in full flight but then must walk away.”

https://www.hifinews.com/content/audio-research-reference-80s-tube-power-amplifier

• Power Output:
  • 70 watts continuous from 20Hz to 20kHz
  • 1kHz total harmonic distortion typically 1% at 140 watts
  • Below 0.04% at 1 watt
• 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 Single-ended
• 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
  • 280 watts in Triode mode
  • 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
  • Faceplate Width: 19.0″ (48.26 cm)
  • 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