Description
A vacuum-tube monaural power amplifier from Audio Research's Reference line, featuring switchable Ultralinear/Triode operation and a transparent faceplate that reveals its glowing KT150 vacuum tubes. Built with a shorter signal path and premium, many custom-made components for a new benchmark in musicality. Available in Natural (Silver) or Black finish.
Features
- Switchable Ultralinear/Triode operation for tonal flexibility
- Proprietary auto-bias circuit — compatible with KT150, KT120, KT88 and 6550 tubes, with no manual bias adjustment ever needed
- Illuminated power meter with adjustable brightness, integrated into the transparent faceplate
- 4-layer circuit board for an ultra-low noise floor
- High Energy Capacity Transformer and bulk storage-capacity network for strong transient response and deep bass authority
- Solid-state power regulation for increased efficiency, stability and reliability
Specifications
Power Output
140W continuous, 20Hz–20kHz
Power Bandwidth
5Hz–70kHz (-3dB)
Frequency Response
0.5Hz–110kHz (-3dB at 1W)
Input Sensitivity
2.4V RMS Balanced (25.5dB gain into 8 ohms)
Input Impedance
200k ohms Balanced
Output Taps
16, 8, 4 ohms
Overall Negative Feedback
14dB
Slew Rate / Rise Time
13V/microsecond / 2.0 microseconds
Power Requirements
105–130VAC 60Hz (210–250VAC 50Hz); 400W at rated output, 700W maximum, 260W idle, 1W off
Tubes Required
2× KT150 (power output), 2× 6H30 (gain stage)
Dimensions
17.25"W × 10"H × 18.5"D (43.8 × 25.4 × 47 cm)
Weight
56 lbs / 25.5 kg net · 73 lbs / 33.2 kg shipping