Multiode single power amplifier kit [limited model]

【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device’s requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer. ■ Compatible vacuum tubes: 1 voltage amplification tube, 2 output tubes *This set includes 2 x 6L6GC (manufactured by JJ) and 1 x ECC83S (12AX7) (manufactured by JJ). ・Voltage amplification tube: 12AX7 (ECC83, 7025) ・Output tube: [LOW mode] 6V6 series, 6F6 series, etc. [HIGH mode] 6L6 series, EL34(6CA7), 5881, 7581, WE350B, KT66, KT77, KT88, KT90, etc. *Although the safety cover cannot be attached, KT120, KT150, KT170, etc. can also be used. ■ Circuit configuration, etc. ・Output stage Class A single, active auto bias (low loss auto bias) ・Heater lighting method Voltage amplification tube: AC lighting ・B power supply MOSFET ripple filter (left and right independent) ・Preamplifier function INPUT-2 has a preamplifier function using an operational amplifier (NJM2068DD is included) ■ Mode switching [Power mode] LOW, HIGH [Output tube connection mode] UL (ultra linear connection), TRIODE (triode connection), PENTODE (pentode connection) ■ Maximum output [HIGH mode] 2 x 7W (6L6), 2 x 8W (EL34), 2 x 8.6W (KT88), 2 x 9.8W (KT170) [LOW mode] 2 x 3.3W (6V6), 2 x 2.6W (6F6) (8Ω, THD10% UL mode) ■ Ratings Input INPUT-1: 850mV rms (at HIGH mode, UL, EL34) INPUT-2: 225mV rms (preamplifier function gain 11.5dB) ■ Frequency characteristics 20 to 50,000Hz (at -3dB, UL, HIGH mode) ■ Residual noise 27µV rms (IHF-A, 8Ω, UL, HIGH, EL34) Input terminals INPUT-1: RCA jack stereo 1 system INPUT-2: 3-pole mini (Φ3.5mm) jack (With preamplifier function by operational amplifier) ■ Output terminal Binding terminal (gold-plated specification, banana plug can be used) Headphone output: 3-pole standard (Φ6.3mm) jack ■ Compatible speaker 4 to 16 Ω (optimal load 6 to 8 Ω) ■ Compatible headphone 8 to 600 Ω (unbalanced) ■ Power supply Voltage 100V AC (50/60Hz) IEC standard 3P inlet type ■ Rated power consumption 80W (HIGH mode, when using KT170), 71W (HIGH mode, when using EL34), 36W (LOW mode, when using 6V6) ■ Body dimensions W252 x H189 x D286 mm (including protrusions when safety cover is attached) ■ Body weight The standard product does not come with a vacuum tube, but it is a great value set that includes a vacuum tube that is only sold on EC. Attached vacuum tubes: 6L6GC (made by JJ) x 2, ECC83S (12AX7) (made by JJ) x 1 The TU-8400 has an "active auto bias function" inherited from the TU-8200R and two power modes, HIGH and LOW. KT120, KT150, and KT170 can also be used because the heater winding has plenty of room. You can also use 6V6 and 6F6 by switching to LOW mode. Although this power amplifier is intended to be used in conjunction with a preamplifier, INPUT-2 on the front has a built-in preamplifier using an operational amplifier, so you can also directly connect mobile devices with low output levels.