【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 *Please prepare vacuum tubes separately Voltage amplification tubes: 2 12AU7 (ECC82, 6189) used Output tubes: [HIGH mode] 6550, KT88, KT90, KT120, KT150, KT170 etc. [MID mode] 6L6GC, 5881, 7581, KT66, KT77, EL34(6CA7) etc. [LOW mode] 6L6, 6L6G, 6L6GB, WE350, etc. *Those that can be used in HIGH mode can be used in MID/LOW mode, and those that can be used in MID mode can also be used in LOW mode.
■Mode switching [Power mode] LOW, MID, HIGH [Output tube connection mode] UL (ultra-linear connection), TRIODE (triode connection)
■Maximum output (8Ω load, THD10%) [HIGH mode] 2 x 16W (KT170, UL), 2 x 13W (KT88, UL), 2 x 9W (KT88, TRIODE) [MID mode] 2 x 9W (KT88, UL), 2× 7.5W (EL34, UL), 2× 6.5W (KT88, TRIODE) [LOW mode] 2× 3.5W (6L6G, UL), 2× 3W (6L6G, TRIODE)
■Rated input (HIGH mode, when using KT88) [UL mode] 850mV rms (at standard NFB), 450mV rms (at HIGH-GAIN) [TRIODE mode] 820mV rms (at standard NFB), 400mV rms (at HIGH-GAIN)
■Frequency characteristics 15 to 60,000Hz (-3dB, UL, standard NFB)
■Residual noise 33µV rms (IHF-A, 8Ω load, standard NFB)
■Input terminal RCA jack stereo
The TU-8850 is a vacuum tube amplifier kit that can use many octal-based (US 8 pin) pentode and beam tubes. *Vacuum tubes are not included, so please prepare them separately. *This product is an assembly kit. This device uses an active auto bias system that automatically adjusts to the optimal bias even if you change the type of pitch, so there is no need for troublesome adjustments when replacing vacuum tubes. Furthermore, there is a "power mode selector switch" on the top of the chassis that switches the voltage and cathode current of the B power supply in three stages, allowing the use of a wide range of output tubes, from small and medium output tubes such as 6L6 to large output tubes such as KT150 and KT170. . ■ Output tube connection mode can be switched Pentode and beam tubes change to triode characteristics when the screen grid is connected to the plate. With this unit, you can switch between UL (ultra-linear) and TRIODE (triode) connections using the "connection mode switch" on the top of the chassis, allowing you to easily enjoy the difference in sound. ■ Gain can be switched This is a power amplifier that is standard for use with a preamplifier, but the preamplifier can be changed by changing the gain by inserting a jumper.
You can get sufficient volume by connecting directly to the LINE output of a sound source device without using a pull-up. ■ Noise countermeasures for headphones In recent years, a wide variety of headphones and earphones with extremely high sound quality have become widespread, and we are also responding to the hot demand for enjoying the sound of vacuum tubes with them. Thorough measures against hum noise have been taken, including the well-established FET type ripple filter and DC lighting of the voltage amplification tube. Of course, even high-efficiency speakers can demonstrate their true value. Furthermore, it is equipped with a jumper-type headphone level adjustment function so that it can be used with ultra-high-efficiency headphones and earphones that tend to have noticeable residual noise. ■ Can also be replaced with large coupling capacitors Capacitors that have a significant impact on sound quality include conductive polymer electrolytic capacitors and polypropylene film capacitors. The coupling capacitor can be replaced with a larger one with a maximum diameter of 22 mm x length of 44 mm, depending on your preference.
