• Overview – The Audio Research VSI55 Tube Integrated Amplifier, released in 2006, is a Class AB tube integrated amplifier using KT88 output tubes, featuring a pure analogue signal path without DAC or phono stage.

• Tube Amplification Character – Delivering classic Audio Research sonics, the Audio Research VSI55 Tube Integrated Amplifier offers open midrange, harmonic richness, and refined treble with excellent musical flow and natural tonal balance.

• Build & Circuit Design – The Audio Research VSI55 Tube Integrated Amplifier employs a fully discrete valve circuit with high-quality transformers, ensuring stable operation, low distortion, and consistent performance across various loudspeaker loads.

• Specifications – 50W per channel into 8 ohms, Class AB push-pull tube design, KT88 output tubes, frequency response 10Hz–40kHz, input impedance 300k ohms, multiple line-level inputs, no internal DAC or phono stage.

• Dimensions – Approximately 483 mm (W) × 178 mm (H) × 381 mm (D), with an open-top chassis design allowing proper heat dissipation and easy tube access.

• Weight – Approximately 22 kg, reflecting heavy-duty output transformers, solid chassis construction, and robust power supply required for stable tube amplifier operation.