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About the VT100
The Audio Research VT100 is a stereo tube power amplifier delivering 100 watts per channel, featuring four pairs of Svetlana 6550 output tubes in a Class AB differential ultralinear circuit with partial cathode coupling for lower output impedance and improved efficiency. Earlier production uses 6922 tubes for input and driver stages, while later Mk II and Mk III revisions substituted 6H30 driver tubes. Fully balanced XLR and single-ended RCA inputs are supported, along with multiple speaker impedance output taps. A Reference-series-derived topology, the VT100 was noted for combining classic tube warmth with strong bass control and wide frequency response.
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