TU-8400 is the Successor Model of TU-8200R.
Aailable in late 2024
There are three versions
1. TU-8400 with stock OPT
2. TU-8400 with Lundahl LL2777B
3. Possible TU-8400 with Silver OPT and AN Silver Cap.. (TBA)
I am still waiting the detail specification from Mr Fujita.
TU-8400 is designed based on EL34 x 2 + 12AX7 x1. There are only two coupling caps. You can run KT170 with TU-8400
etc..
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Specs;
(TENTATIVE as of May 20th)
Model No. : TU-8400E/VK
Tubes : PRE: 12AX7 (ECC83, 7025) x 1pc
OUTPUT : 6V6 series, 6F6 series, etc ... LOW mode,
6L6 series, EL34(6CA7), 5881, 7581m WE350B, KT66, KT77, KT88, KT90 etc ... HIGH mode
*KT120, KT150, KT170 are also usable but they do not fit in the safety cover attached.
Circuit configurations : Vacuum tube stereo power amplifier
Output stage : A-class single ended, active automatic bias adjustment (low loss automatic bias)
Heater ON : PRE tube : AC-power
B-power : MOSFET ripple filter (Right and left channel independent)
Preamp function : An OP-amp NJM2068DD equipped in INPUT-2.
Mode : Power mode : LOW, HIGH
Output tube connection mode : Ultra Linear, Triode, Pentode
Max. output (8ohm load, THL10%, UL mode) : HIGH : 2 x 7W(6L6), 2 x 8W (EL34), 2 x 8.6W (KT88), 2 x 9.8W (KT170)
LOW : 2 x 3.3W (6V6), 2 x 2.6W (6F6)
Rated input (HIGH mode, UL, EL34) : 850mV rms (INPUT-1), 220mV (INPUT-2)
INPUT-2 preamp function gain : 11.5dB
Frequency response (-3dB, UL, HIGH) : 20 - 50,000Hz
Residual noise (IHF-A, 8ohm, UL, HIGH, EL34) : 27uV rms
Input terminal : RCA jack, Stereo 1 line (INPUT-1, 50kohm), 3-pole mini (3.5mm dia.) jack (INPUT-2, 12kohm, preamp function)
Output terminal : Binding terminal (gold-plated, banana plug usable)
Headphone terminal (3-pole standard (6.3mm dia.) jack)
Speaker impedance : 4 - 16 ohm (optimal load 6 - 8ohm)
Headphone impedance : 8 - 600 ohm (corresponds to high-impedance headphones as well), unbalanced
IEC standard 3P inlet type
Rated power consumption : 95W (HIGH mode, KT170), 71W (HIGH mode, EL34), 36W (LOW mode, 6V6)
Dimensions : W252 x H189 x D286 mm (With safety cover, including projections)
Weight : Approx.6.6kg (Assembled, excluding tubes and power cord)
(TENTATIVE as of May 20th)
Model No. : TU-8400E/VK
Tubes : PRE: 12AX7 (ECC83, 7025) x 1pc
OUTPUT : 6V6 series, 6F6 series, etc ... LOW mode,
6L6 series, EL34(6CA7), 5881, 7581m WE350B, KT66, KT77, KT88, KT90 etc ... HIGH mode
*KT120, KT150, KT170 are also usable but they do not fit in the safety cover attached.
Circuit configurations : Vacuum tube stereo power amplifier
Output stage : A-class single ended, active automatic bias adjustment (low loss automatic bias)
Heater ON : PRE tube : AC-power
B-power : MOSFET ripple filter (Right and left channel independent)
Preamp function : An OP-amp NJM2068DD equipped in INPUT-2.
Mode : Power mode : LOW, HIGH
Output tube connection mode : Ultra Linear, Triode, Pentode
Max. output (8ohm load, THL10%, UL mode) : HIGH : 2 x 7W(6L6), 2 x 8W (EL34), 2 x 8.6W (KT88), 2 x 9.8W (KT170)
LOW : 2 x 3.3W (6V6), 2 x 2.6W (6F6)
Rated input (HIGH mode, UL, EL34) : 850mV rms (INPUT-1), 220mV (INPUT-2)
INPUT-2 preamp function gain : 11.5dB
Frequency response (-3dB, UL, HIGH) : 20 - 50,000Hz
Residual noise (IHF-A, 8ohm, UL, HIGH, EL34) : 27uV rms
Input terminal : RCA jack, Stereo 1 line (INPUT-1, 50kohm), 3-pole mini (3.5mm dia.) jack (INPUT-2, 12kohm, preamp function)
Output terminal : Binding terminal (gold-plated, banana plug usable)
Headphone terminal (3-pole standard (6.3mm dia.) jack)
Speaker impedance : 4 - 16 ohm (optimal load 6 - 8ohm)
Headphone impedance : 8 - 600 ohm (corresponds to high-impedance headphones as well), unbalanced
IEC standard 3P inlet type
Rated power consumption : 95W (HIGH mode, KT170), 71W (HIGH mode, EL34), 36W (LOW mode, 6V6)
Dimensions : W252 x H189 x D286 mm (With safety cover, including projections)
Weight : Approx.6.6kg (Assembled, excluding tubes and power cord)
