By Lam Seng Fatt
The new Audio Research VT80 power amplifier will be launched by Perfect Hi-Fi at this weekend’s Kuala Lumpur International AV Show.
This new design, which is part of Audio Research’s Foundation series, is exciting as it has two unique features not found in any other Audio Research amplifier.
From its website: “The first is a proprietary auto-bias circuit developed entirely in-house by our engineering department. Simply drop in the tubes and the VT80 will adjust bias for each output tube. The circuit automatically adjusts for tube wear or fluctuations in the power in real time. It will also work for different types of output tubes, including 6550, KT88, KT90, KT120 or KT150. The adjustment range is wide, but matched tubes from Audio Research still provide the highest performance. Finally, an auto-bias circuit that works in real time and does not compromise performance.”
The second new feature is the fusing of each output tube. In case of a fault condition in a tube, an easily replaceable fuse will blow, not a resistor.
THE VT80 is adapted from the Reference 75 and uses the same power and output transformers, similar circuit topology, and many of the same parts.
The 75 watt-per-channel VT80 offers striking dynamics, powerful bass, and natural clarity combined with a very holographic presentation.