Kora TB140

Technical characteristics

Power source
  • Prise CEI, 230 V AC, +7% ~ -10%, (117 V AC on demand).
  • Maximum power consumption (2 x 100 /4Ω) : 310 VA,
  • Maximum power consumption (2 x 70 W/8 Ω) : 210 W
Power supply transformer 300 VA toroidal transformer Two 10 VA power transformers (auxiliary voltages)
Main filtering 2 x 44.000 μF
Power output and distribution 2 x 70 W/8 Ω, 2 x 100 W/4 Ω.
Output power distribution made by four complementary highly linear – power transistors «MOTOROLA ®» (225 W/15 A each)
Inputs Phono MM, internal impedance: 47 kΩ, sensibility: 4 mV, RIAA Correction. 4 entry lines, internal impedance: 15 kΩ, sensibility 1 V. Pre-out, impedance 2 kΩ, after volume adjustment
Passband 20 Hz – 20.000 Hz ± 1dB
Dimensions 118 x 420 x 370 mm
Weight 9,5 Kg

These specifications are subject to change without notice.


Like the entire range of Kora amplifiers, the TB140 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.
  • The amplifier is highly stable, even on complex loads.

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