Description
CONDITION: NEW
〇〇Set (version)" includes all vacuum tubes.
*In the case of "Plum Set (JJ ECC82/PSVANE 300B)", "JJ ECC82*2" and "PSVANE 300B*1 pair" are included.
*In the case of "Bamboo Set (JJ ECC82・Prime 300B ver.4)", "JJ ECC82*2" and "Prime 300B ver.4*1 pair" are included.
*In the case of "Matsu set (GL ECC82/PSVANE WE300B)", "Gold Lion ECC82*2" and "PSVANE WE300B*1 pair" are included.
*For the "strongest version", "Gold Lion ECC82*2", "Western Electric 300B*1 pair", and "Arizona 0.1uF*2 pieces" are included.
*In the case of "Peach Set (JJ ECC82/EH 2A3 GOLD)", "JJ ECC82*2" and "EH 2A3 GOLD GRID*1 pair" are included.
*In the case of "Sakura set (GL ECC82/KR 2A3)", "Gold Lion ECC82*2" and "KR 2A3*1 pair" are included.
"300B" and "2A3" are direct-heated triodes that are very popular among audiophiles. The "300B" with its plump midrange and deep bass, and the "2A3" with its delicate expressive power and gentle tone, these two similar and different types of vacuum tubes can be used without any special settings changes. 8900, you can enjoy it with one device. Currently, many vacuum tube manufacturers manufacture a wide variety of "300B" and "2A3" types, and the range of choices is even wider.
■ Automatic discrimination between 300B and 2A3
"300B" and "2A3" are vacuum tubes that look very similar in appearance, but due to differences in filament voltage and operating point, it is necessary to switch the supply voltage. The TU-8900 automatically identifies the vacuum tubes installed and automatically sets the filament voltage and B voltage to match each vacuum tube. When 300B is installed, the left and right sides around the volume glow blue, and when 2A3 is installed, they glow green. In addition, if excessive current flows due to a vacuum tube abnormality, the channel side with the abnormality will glow red and the current will be shut down to protect you.
■ Newly designed power supply circuit
The windings of the power transformer are wound separately on the left and right sides to minimize interference between channels. The latest DC-DC converter with ultra-low noise and high efficiency is used for the filament power supply. In addition, by using a Schottky barrier diode and a fast recovery diode as rectifier diodes, even slight spike noise is minimized. Even when using highly efficient headphones, you can enjoy music without worrying about noise. The main circuit of the power supply section is divided into units for each channel and shipped as modules.
■ Design that is friendly to directly heated tubes
The warm-up time for circuits that include a mixture of directly heated tubes and indirectly heated tubes is very different, which puts a strain on the directly heated tubes that start up first, but the TU-8900 has a soft start function that slowly increases the voltage. This reduces the burden on the direct heating pipes.
■ Easy to change to NON-NFB (non-feedback)
Many people may want to listen to the sound of a non-feedback tube because it is a triode with good bare characteristics. The TU-8900 can be easily converted to a non-feedback amplifier by changing the position of the shorting plug on the board. With no feedback, the gain increases by approximately 8dB.
■ 12BH7A can also be used as a voltage amplification tube
Although the standard voltage amplification tube is 12AU7, it is also possible to use 12BH7A, which has a higher drive capacity.
■ Adopts a highly reliable vacuum tube socket The
4-pin socket for the 300B/2A3 uses a highly reliable 4-pin socket that was developed through discussions with manufacturers. It provides a secure fit even after installation.
■ Can also be replaced with large coupling capacitors
Conductive polymer electrolytic capacitors and polypropylene film capacitors are often used as capacitors that have a large effect on sound quality. 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.
■ Volume settings that match the headphones
Headphone level can be easily changed by removing the front panel and changing the position of the short pin.
■ The bonnet is made of highly heat-resistant polycarbonate
The Electrical Appliance and Material Safety Law and the international standard IEC strictly stipulate temperature limits for each material such as the casing. The temperature of the cover at the top of the output tube reaches a high temperature of nearly 100℃, so in order to comply with safety standards, the bonnet is made of polycarbonate, which is both heat resistant and robust.
●Vacuum tubes used: 300B (or 2A3) x 2, 12AU7 (or 12BH7A) x 2
*Vacuum tubes are not included.
*Unless otherwise specified, 300B+12AU7 installed, NFB included, 8Ω load
●Rated output: 8W+8W (at 300B) / 3.5W+3.5W (at 2A3) <THD 10%>
●Rated input: 1Vrms (at 300B) / 650mVrms (at 2A3)
●Residual noise: 15μV (IHF-A)
●Frequency characteristics: 7Hz to 90kHz (with NFB) / 12Hz to 45kHz (without NFB)
●Input impedance: 50kΩ
●Output impedance: 4 to 6.3Ω, 8 to 16Ω (switched by switch on the back)
●Input terminal: LINE x 1
●Output terminal: Speaker output terminal: Gold-plated screw terminal (banana plug can be used)
Headphone terminal: 6.3mm headphone jack
●Power supply voltage: AC100V 50/60Hz (3P Inlet)
●Power consumption: 95W (at 300B) / 65W (at 2A3)
●Body dimensions: W356 x H214 x D320mm (including protrusions)
●Body weight: Approx. 11.2kg (excluding power cord)
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