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audio reserch LS 2B MK ll
Audio Research LS2B MKII is a classic hybrid tube and solid-state balanced line-stage preamplifier introduced in the early 1990s.
Overview & Design
• Type: Hybrid FET/tube line-stage preamplifier (no built-in phono stage).
• Tube Complement: Uses a single 6922 (or E88CC) twin-triode vacuum tube to add subtle warmth to the signal path.
• Circuit: Pure Class-A gain stage featuring a "Direct Gain Path" option for maximum signal purity.
• Balanced Connectivity: Features true balanced inputs and outputs using XLR connectors alongside standard single-ended RCA jacks (the "B" stands for Balanced).
Key Specifications
• Frequency Response: 1Hz to 100kHz (±0.5dB).
• Total Harmonic Distortion (THD): Less than 0.01% at 2V RMS.
• Gain: 18dB (main/unbalanced) / 24dB (balanced).
• Input Impedance: 50K ohms unbalanced / 3M ohms balanced.
• Dimensions & Weight: Standard 19" width, 5.25" height, 10.25"