THE HIGH FIDELITY INNOVATIVE COMPANY
SQUARE TUBE
Patented technology. The Square Tube technology is a new way of assembling electronic tubes to amplify an audio signal.
The “SQUARE TUBE” is the result of long research and long-term assessment. The tubes – a well-known technology – are used in a modern and innovative way. Four tubes are used to make a single amplification stage, hence the name.
Powered by two tensions, a positive and a negative, the Square Tube® delivers a signal that is symmetrical to the reference (the ground).
That means that the signal alternatively reaches the positively charged domain (to push the membrane of the speaker) and the negatively charged domain (to pull the membrane).
This innovative and original architecture along with the usage of vacuum tubes makes this scheme suits particularly well the staged amplification method.
All the high-fidelity Kora elements are designed and engineered by a team of R&D specialized in high-precision instruments for laboratory use. They also are long-time passionate audiophiles. Kora Company can also count on the listening expertise of professional musicians as well as internationally recognized solo artists.
All the Kora products are also fully designed and hand-assembled in Toulouse, the cradle of the European Aeronautical industry. Thanks to this strategic localization, Kora can draw on an extensive network of highly qualified subcontractors and suppliers, used to providing extremely high-quality products and services.
About the Kora TB140, “It strikes a careful balance between tightness, control, linearity, and expression on the one hand, and refinement, fluidity, and air on the other. Meanwhile, the amp has SET-like purity, quite bizarrely combined with amazing bass control, while driving any speaker, even Magico Q5’s”
Christiaan Punter, HI-FI Advice.com
MORE INFORMATION?
For technical specifications, visit the Kora High Fidelity WEBSITE.
For orders and other inquiries, give us a call or email/send us a message using the contact form at the bottom of this page.
Kora CD Player 140
CD Player Transport NZ$12,400
DESCRIPTION
The CD140 combines a digital section (32 bits in 768 kHz) with an analog tube output. This output stage uses the Square Tube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuit gives the analog signal all its qualities.
Digital signal processing recovers all the information recorded on the CD. AKM’s chip upsamples the signal to 768 kHz. This allows the signal to be filtered at higher frequencies, removing the residue of the digital conversion from the audible band. A circuit developed by Kora ensures that all digital clocks remain synchronized with the original CD signal. Digital -to-analog conversion is entrusted to a latest-generation ROHM DAC.
The Square Tube® ensures smooth, precise musicality. Powered by high voltage, the output stage has no amplitude limits: signal dynamics remain natural. With a pure-analog output filter, the respect of phases ensures exceptional spatialization. You’re totally immersed in a three- dimensional soundstage!
Kora DAC 140
Digital to Analog Converter NZ$16,100
DESCRIPTION
Kora wished to offer you a converter whose design and realization leave no room for compromise.
8 inputs (SPDIF, optical, AES-EBU, USB) make your Kora DAC the nerve center of your system.
Technologically, as on the CD player, the clocks are realized by frequency multipliers, and are therefore in perfect synchronization with the sources.
Thanks to an AKM “up sampling” circuit, the digital flow is transformed into 32 bits and a maximum frequency of 768 kHz.
At the output of the converter, a “Square Tube” circuit ensures the filtering and the provision of the audio signal at the output. An additional balanced output is offered on a pair of XLR sockets.
Kora Phono Stage
Turntable Phono Stage Amplifier NZ$11,800
DESCRIPTION
The Kora Phono stage is a real «Swiss army knife» that will enable you to extract all the subtleties of your vinyl records while respecting the requirements of your pickup.
The phono Stage Kora is an audio adaptation of the EPC1 D, an ultra-low-noise laboratory preamplifier with unique characteristics (built by Kora’s professional division).
In the input stage, high-precision metal foil resistors are used. The Phono Stage adapts to all types of pickups, whether variable reluctance, moving magnets or moving coils.
The preamplifier features four individually programmable inputs. For each, you can set gain, input impedance, input capacitance and connection type. Two inputs are on three-pin «XLR» type sockets, which can be used to receive a cell connected symmetrically (two signal wires plus ground) or asymmetrically (one signal wire and a reference, ground). Two other inputs are coaxial «RCA» sockets. These two inputs are unbalanced by design.
The preamplifier has two unbalanced and two balanced outputs that can operate simultaneously.
On start-up, the phono adapter retains its previous programming. Without any action on your part, the previously used input is displayed and confirmed. To change input, simply rotate the encoder to select the active input. Each time the input is changed, the phono adapter is automatically reconfigured without further intervention.
All programmed parameters are stored in memory..
Kora TB140
70 Watts Integrated Power Amplifier NZ$9,990
DESCRIPTION
Like the entire Kora amplifier range, the TB140 is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuitry provides very unique musical qualities to the amplifier.
SquareTube® provides every amplification functions. Its output voltage is the one that will be applied to the speaker outputs. Audio power transistors, exceptionally linear, are the only ones to provide what technicians call “impedance matching”. The transistors will give the speakers the required current, without amplifying the signal. Their role is somewhat the same as the one generally assigned to the output transformer.
However, the SquareTube® / Transistors combination does not know the difficulties associated with the usual transformers:
> no phase shifts on low frequencies,
> no phase shifts on high frequencies,
> no bad coupling on low end,
> and above all: no current limitation!
The combination of SquareTube®’s high voltage capacity and the high current of the output transistors gives you an unmatched high definition power amplifier.
> The tubes give you softness, the transistors offer you unrestrained energy
> SquareTube® offers phase accuracy and will reveal an abundance of unsuspected details from your sources with natural dynamics.
> The amplifier is highly stable, even on complex loads.
Kora TB200
100 Watts Integrated Power Amplifier NZ$20,950
DESCRIPTION
Like the entire Kora amplifier range, the TB200 is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuitry provides very unique musical qualities to the amplifier.
SquareTube® provides every amplification functions. Its output voltage is the one that will be applied to the speaker outputs. Audio power transistors, exceptionally linear, are the only ones to provide what technicians call “impedance matching”. The transistors will give the speakers the required current, without amplifying the signal. Their role is somewhat the same as the one generally assigned to the output transformer.
However, the SquareTube® / Transistors combination does not know the difficulties associated with the usual transformers:
> no phase shifts on low frequencies,
> no phase shifts on high frequencies,
> no bad coupling on low end,
> and above all: no current limitation!
The combination of SquareTube®’s high voltage capacity and the high current of the output transistors gives you an unmatched high definition power amplifier.
> The tubes give you softness, the transistors offer you unrestrained energy
> SquareTube® offers phase accuracy and will reveal an abundance of unsuspected details from your sources with natural dynamics.
> The amplifier is highly stable, even on complex loads.
Kora TB400
200 Watts Integrated Power Amplifier NZ$29,500
DESCRIPTION
Like the entire Kora amplifier range, the TB400 is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuitry provides very unique musical qualities to the amplifier.
SquareTube® provides every amplification functions. Its output voltage is the one that will be applied to the speaker outputs. Audio power transistors, exceptionally linear, are the only ones to provide what technicians call “impedance matching”. The transistors will give the speakers the required current, without amplifying the signal. Their role is somewhat the same as the one generally assigned to the output transformer.
However, the SquareTube® / Transistors combination does not know the difficulties associated with the usual transformers:
> no phase shifts on low frequencies,
> no phase shifts on high frequencies,
> no bad coupling on low end,
> and above all: no current limitation!
The combination of SquareTube®’s high voltage capacity and the high current of the output transistors gives you an unmatched high definition power amplifier.
> The tubes give you softness, the transistors offer you unrestrained energy
> SquareTube® offers phase accuracy and will reveal an abundance of unsuspected details from your sources with natural dynamics.
> The amplifier is highly stable, even on complex loads.
Kora PRE AMP 140
Preamplifier NZ$10,500
DESCRIPTION
Preamplifier 140
Like most Kora devices, the PR 140 is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuit gives the analog signal
all its qualities. The reproduction of the tiniest details, and a respected dynamic range, give the PR 140 preamplifier a smooth, precise musicality and a natural feel. You forget about the system, and immerse yourself completely in the three-dimensional soundstage.
In addition to the basic functions (volume, balance), the PR140 lets you balance the level of each of the five inputs (one balanced, four coaxial). Outputs are energetic and assertive, even on long cables.
Your PR140 can be extended! This is an option you can add to your preamplifier. It comes in the form of a drawer that you can place yourself to extend the range of possibilities offered by your device.
A phono option: so you can plug in your vinyl turntable (MM/MC), DAC option: for connecting your digital signals. (2 coaxial, 2 optical)
Kora DAC Module
DAC Module for Preamplifier NZ$5,100
DESCRIPTION
Your PR140 can be extended! This is an option you can add to your preamplifier.
It comes in the form of a drawer that you can place yourself to extend the range of possibilities offered by your device.
DAC option: for connecting your digital signals. (2 coaxial, 2 optical)
Kora Phono Module
Turntable Phono Stage Amp Module NZ$3,400
DESCRIPTION
Your PR140 can be extended! This is an option you can add to your preamplifier.
It comes in the form of a drawer that you can place yourself to extend the range of possibilities offered by your device.
A phono option: so you can plug in your vinyl turntable (MM/MC)
Kora TA240
120 Watts Power Amplifier NZ$20,950
DESCRIPTION
Like the entire Kora amplifier range, the TA240is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuitry provides very unique musical qualities to the amplifier.
SquareTube® provides every amplification functions. Its output voltage is the one that will be applied to the speaker outputs. Audio power transistors, exceptionally linear, are the only ones to provide what technicians call “impedance matching”. The transistors will give the speakers the required current, without amplifying the signal. Their role is somewhat the same as the one generally assigned to the output transformer.
However, the SquareTube® / Transistors combination does not know the difficulties associated with the usual transformers:
> no phase shifts on low frequencies,
> no phase shifts on high frequencies,
> no bad coupling on low end,
> and above all: no current limitation!
The combination of SquareTube®’s high voltage capacity and the high current of the output transistors gives you an unmatched high definition power amplifier.
> The tubes give you softness, the transistors offer you unrestrained energy
> SquareTube® offers phase accuracy and will reveal an abundance of unsuspected details from your sources with natural dynamics.
> The amplifier is highly stable, even on complex loads.
Kora TA480
240 Watts Power Amplifier NZ$29,500
DESCRIPTION
Like the entire Kora amplifier range, the TA480 is powered by the SquareTube® operational amplifier. Equipped with 4 triodes per channel, this innovative circuitry provides very unique musical qualities to the amplifier.
SquareTube® provides every amplification functions. Its output voltage is the one that will be applied to the speaker outputs. Audio power transistors, exceptionally linear, are the only ones to provide what technicians call “impedance matching”. The transistors will give the speakers the required current, without amplifying the signal. Their role is somewhat the same as the one generally assigned to the output transformer.
However, the SquareTube® / Transistors combination does not know the difficulties associated with the usual transformers:
> no phase shifts on low frequencies,
> no phase shifts on high frequencies,
> no bad coupling on low end,
> and above all: no current limitation!
The combination of SquareTube®’s high voltage capacity and the high current of the output transistors gives you an unmatched high definition power amplifier.
> The tubes give you softness, the transistors offer you unrestrained energy
> SquareTube® offers phase accuracy and will reveal an abundance of unsuspected details from your sources with natural dynamics.
> The amplifier is highly stable, even on complex loads.
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