Kora TB200 integrated amplifier

"Like the entire range of Kora amplifiers, the TB200 is powered by the Square Tube® operational amplifier. Equipped with 4 triodes per channel, this innovative assembling gives all its 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.

General features

Overall dimension
168 x 420 x 350 mm
Box size only
150 x 420 x 320 mm
Unit weight
17,3 kg
Manufacturer warranty
5 years
Aluminium & steel
Mineral grey
Remote control, power supply cord, instruction manual
Construction & design
Toulouse, Occitanie region, France

Electronic features

Power source
CEI plug 230 V AC +7% ~ -10% (117 V AC on demand) Maximum power consumption (2 x 180 W/4 Ω): 610 VA Maximum power consumption (2 x 100 W/8 Ω): 310 W
Internal power supply
2 x (± 50 V DC), double power supply
Power supply transformer
2 x 300 VA. Additional voltage provided by 5 DC/DC modules and two linear controllers
Main filtering
60 000 µF par canal
High voltage
+ 300 V Stabilized, - 200 V Stabilized
Heating of the inlet tubes
2 x 12 V DC Regulated and ground referenced voltages
Heating of the outlet tubes
2 x 12 V DC Isolated DC regulated voltages
Power output & distribution
2 x 100 W/8 Ω, 2 x 180 W/4 Ω. Output power distribution made by twelve complementary highly linear - power transistors «MOTOROLA ®» (225 W/15 A each)
4 entry lines, sensibility 1 V, internal impedance: 15 kΩ
20 Hz - 20 000 Hz ± 1 dB
Internal impedance
Output: < 0.08 Ω