Kora TB 140 Integrated Amplifier

Built to order

$6,999.00

Color

Black

Need advice? Want a price match?

Talk to Mike

Third-generation owner

Call or text: 410-239-2020

Yes, that's literally his cell

At this level, every detail matters: your room, your system, what you’re driving it with, what you’re listening to. I handle these orders personally because an investment like this deserves more than an Add to Cart button. We’ll work through system synergy, I’ll make sure the setup is right, and we’ll coordinate delivery so it arrives exactly how it should. A few of our brands require this direct approach, but at this price point, it’s how I’d do it anyway. Use the button above, or call/text me directly at 410-239-2020.

Availability

Bruno and his team build 120v units to order, extended lead time of 1-2 months.

See our Terms & Conditions for details.

Family-Owned Authorized Dealer

We're an authorized dealer for every brand listed on this site, so your warranty is valid and fully supported. We're a real brick-and-mortar shop in Chestertown, MD with shelves of actual inventory, not a drop-shipper. Family-owned and run for three generations, since 1978.

*Free Delivery and Shipping

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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. All of the amplification and signal control happens in the tube stage; the transistors simply supply the current your speakers need without adding their own character, for 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	Aluminum 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 to 20,000 Hz (±1 dB)
Internal Impedance	Output: < 0.08 Ω

Is the Kora TB 140 a tube amplifier or a hybrid?

Kora calls it a tube amplifier assisted by transistors. All the amplification is done by its Square Tube circuit, four triodes per channel. Four complementary ON Semi power transistors then supply the current the speakers need without taking part in amplifying the signal, which lets Kora do without an output transformer. Kora stresses that this is not the usual hybrid of a tube preamp feeding a solid-state power amp.

Does the TB 140 have a phono input?

Yes, for moving magnet cartridges: input 5 is an MM phono stage with 47k ohm loading and 4mV sensitivity, alongside four line inputs and a pre-out. Kora lists no moving coil option for the TB 140; its MM/MC phono module is listed for the PR 140 preamplifier. For a moving coil cartridge, Get in touch with Mike about a separate phono stage.

Kora TB 140 or TB 200: what does the TB 200 add?

More power and current. The TB 200 makes 100 watts per channel into 8 ohms and 180 into 4, against the TB 140's 70 and 100, with twelve output transistors instead of four, two 300VA transformers instead of one, and more filtering. It weighs 19kg to the TB 140's 9.5kg. The TB 200 has no phono input, where the TB 140 has an MM stage, and its input 4 can also be set as a pre-out for a subwoofer.

Will changing tubes change the TB 140's sound?

Kora says no. Its Square Tube circuit keeps the tubes correctly biased whatever their brand or age, so changing brands does not change the sound. Kora also runs the output tubes below their nominal current by design, which it says gives them an exceptional service life.

Can the TB 140 be used in a home theater, and is it set up for US power?

Input 4 can be set in the menu as a bypass input, which turns the TB 140 into a power amplifier driven by a source with its own volume control, such as a surround processor; the settings menu is reached only from the front knob, not the remote. Kora sets the mains voltage at the factory and marks it on the back: 230V standard, with 117V available on request.