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The successor to the very popular TU-8200R power amp kit, the TU-8400 is another impressive example of single ended tube amp design by Elekit of Japan. 

Designed on the same compact footprint as the TU-8200R (one square foot) the TU-8400 presents in an all black livery for a striking visual impact.

Elekit's active automatic bias adjustment and a new power switching mode provides immediate support for a wide range of pentode tubes, from 6V6 to KT170 as well as mid power pentode tubes such as 6L6, EL34(6CA7), KT77, and KT88.

The kit is therefore supplied without tubes. A tube set option is available: see product  listing tu-8400-tube-set.

Maintained is the ability to select Triode, Ultralinear or Pentode mode operation.

The TU-8400 is primarily a power amp designed to be used with a preamplifier. The amp also has an inbuilt Op-amp supporting the front mounted 3.5mm input for smart device connection.

A highly effective FET ripple filter design eliminates hum with individual filters for each channel.

Required tube complement is:

• Voltage amplifying tube 12AX7 (ECC83, 7025) x 1pc
• Output tubes x 2 pcs

Specifications:

*The values are representative values and not guaranteed values. 

Model No. TU-8400

Tubes : Voltage amplifying tube : 12AX7 (ECC83, 7025) x 1pc

            Output tube : 6L6 series, 5881, 7581, KT66, KT77, EL34(6CA7), WE350B, 6550, KT88, KT90, KT120, KT150, KT170, etc … HIGH mode

6V6, 6F6, etc … LOW mode

*Not included

Circuit configurations, etc Vacuum Tube Stereo Power amplifier

Output stage A-class, Single-ended, Active automatic bias (low-dissipation automatic biasing)

Heater power AC-power

B-power : MOSFET ripple filter (right and left channel independently, with fuse)

Mode : [Power mode] LOW, HIGH

[Output tube connection mode] UL(Ultra-linear, recommended), TRIODE, PENTODE

Max.output [HIGH mode] 2 x 9.8W(KT170), 2 x 8.6W(KT88), 2 x 8W(EL34), 2 x 7W(6L6)

[LOW mode] 2 x 3.3W(6V6), 2 x 2.6W (6F6)

(UL, 8ohm load, THD10%)

Rated input : [INPUT-1] 850mV rms

[INPUT-2] 225mV rms

(HIGH mode, UL, EL34)

Frequency response : 20-50,000Hz

(-3dB, UL)

Residual noise : 27uV rms

(IHF-A, 8ohm load, UL, HIGH)

Input terminal : [INPUT-1] RCA jack (back side), input resistance approx.50hohm

[INPUT-2] 3.5mm 3-pole mini jack, input resistance approx.12kohm

Output terminal : Biding terminal (Gold-plated, banana-plug compatible)

Headphone output : 3-pole standard (diameter 6.3mm) jack

Speaker impedance : 4-16ohm

Headphone impedance : 8-600ohm (corresponds to high impedance headphones as well), unbalanced

Power voltage : AC110-120V or AC220-240V, 50/60Hz

IEC standard 3P inlet type

Rated power consumption : 80W (HIGH mode, KT170), 71W (HIGH mode, EL34), 36W (LOW mode, 6V6)

Dimensions : W252 x H286 x D286 mm (with safety cover, incl. projections)

Weight : Approx.6.6kg (assembled, excl. tubes and AC cord)