The Kora TB 140 Integrated Amplifier embodies the essence of Kora’s acclaimed SquareTube® technology, blending the warmth of tubes with the drive and precision of transistors. Featuring 4 triodes per channel, the SquareTube® stage handles all amplification and signal control, delivering unmatched clarity, phase accuracy, and musical refinement. By using hyper-linear complementary transistors solely for current delivery, the TB 140 achieves a seamless synergy where tubes shape the sound and transistors unleash effortless energy. The result is a dynamic, natural, and highly stable amplifier that reveals hidden detail and musical nuance, even when driving complex speaker loads. Square Tube Technology The TB140 introduces listeners to Kora’s Square Tube Technology in its most approachable form, proving that high-end engineering can be both accessible and refined. The tube stage lays down a rich, organic foundation, while the solid-state output delivers grip and stability that keeps the music locked in place. This balance of warmth and precision makes the TB140 a standout entry point into Kora’s philosophy, offering a taste of their flagship design approach in a more compact and versatile package. Learn more about Square Tube Technology. Key Features SquareTube® Amplification – 4 triodes per channel for pure tube-driven signal control with transistor-backed current delivery. Phase Accuracy – No phase shifts in low or high frequencies for precise, natural sound reproduction. Dynamic Energy – Tubes provide smoothness and warmth, while transistors deliver unlimited current and impact. High Stability – Maintains consistent performance with complex loads, ensuring reliability across demanding speakers. Natural Musicality – Extracts subtle details and dynamics from any source, offering lifelike soundstage and definition. The Listening Room Difference We’re a third-generation family business with a brick-and-mortar showroom in Chestertown, Maryland, and a reputation built on trust, not hype. Whether you’re visiting in person or ordering online, we bring decades of experience, personalized service, and honest guidance to every interaction. We don’t just ship boxes. We help build systems, answer your questions like real humans, and make sure every detail of your setup is right, from the cables to the final connection. Our passion is helping you get the most out of your gear, with support that lasts well beyond the sale. Specifications General Characteristics Overall Dimensions 118 × 420 × 370 mm Chassis Size Only – Unit Weight 9.5 kg Manufacturer’s Warranty 5 years Materials Aluminium and steel Finish Mineral grey Accessories Power chord, instructions Construction & Design Toulouse, Occitania region, France Electronic Features Power Supply IEC 230 V AC socket, +7% ~ ‒10% (117 V AC on request) Maximum Power Input 310 VA (2 × 100 W / 4 Ω) Maximum Power Consumption 210 W (2 × 70 W / 8 Ω) Internal Power Supply 2 × (± 44 V DC), dual power supply Power Supply Transformer 300 VA toroidal transformer + 2 × 10 VA auxiliary transformers Main Filtering 2 × 44,000 µF High Voltage +250 V stabilized, ‒165 V stabilized Input Tube Heater 2 × 12 V DC, regulated and grounded Output Tube Heating 2 × 12 V AC, isolated regulated voltages Output Power 2 × 70 W / 8 Ω, 2 × 100 W / 4 Ω Output Power Distribution 4 complementary highly linear ON SEMI® power transistors (225 W / 15 A each) Inputs Phono MM (47 kΩ), 4 × Line Inputs (15 kΩ), Pre-out (2 kΩ) Sensitivity Phono MM: 4 mV (RIAA curve), Line: 1 V Pre-out After the volume setting Bandwidth 20 Hz – 20,000 Hz (±1 dB) Internal Impedance Output: < 0.08 Ω
