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Location: Shizuoka
Ships to: US,
Item: 256177832898
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All returns accepted:Returns Accepted
Item must be returned within:60 Days
Refund will be given as:Money back or replacement (buyer’s choice)
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Elekit:Elekit
Voltage:AC 100V
Elekit 300B 2A3 Single Power Amplifier Kit TU-8900 Not assembled Vacuum tube not included DescriptionThe “300B” and “2A3” direct-heated triodes are very popular among audiophiles.The “300B” is attractive for its rich midrange and deep bass, and the “2A3” is attractive for its delicate expressive power and gentle tone. 8900, you can enjoy it with one unit. Currently, many vacuum tube manufacturers are producing a wide variety of “300B” and “2A3″, and the range of choices is even wider.*Vacuum tubes are not included in order to make effective use of the vacuum tubes owned by enthusiasts. ■ Automatic detection of 300B and 2A3″300B” and “2A3” are very similar in appearance, but due to the difference in filament voltage and operating point, it is necessary to switch the supply voltage. The TU-8900 automatically detects which vacuum tube is installed, and automatically sets the filament voltage and B voltage to suit each vacuum tube. When 300B is installed, the left and right sides of the volume will glow blue, and when 2A3 is installed, it will glow green. In addition, due to an abnormality in the vacuum tube, etc., when an excessive current flows, the abnormal channel side glows red, and the current is shut down for protection. ■ Newly designed power circuitThe windings of the power transformer are separately wound on the left and right sides to suppress interference between channels as much as possible. The latest DC-DC converter with ultra-low noise and high efficiency is used for the filament power supply. Moreover, the rectifier diode is using a Schottky barrier diode and a fast recovery diode, and the slight spike noise is also minimized. You can enjoy music without worrying about noise even when using high-efficiency headphones. The main circuit of the power supply section is unitized for each channel and packaged as a module. ■ Design friendly to direct heat pipesSince the warm-up time differs greatly in a circuit that mixes directly heated tubes and indirectly heated tubes, the directly heated tubes that start up first are burdened. It reduces the burden. ■ Easy to change to NON-NFB (non-feedback)Many people may say that they want to listen to non-feedback sound because the triode tube has good bare characteristics. With the TU-8900, you can easily change to a non-feedback amplifier by changing the position of the jumper plug on the board. By using non-feedback, the gain increases by about 8dB. ■ 12BH7A voltage amplification tube can also be usedThe standard voltage amplification tube is 12AU7, but 12BH7A with high drive capability can also be used. ■ Uses a highly reliable vacuum tube socketThe 4-pin socket for 300B/2A3 adopts a highly reliable one that was completed while exchanging opinions with the manufacturer. You can get a firm fit even after mounting. ■ Can be replaced with a large coupling capacitorConductive polymer electrolytic capacitors and polypropylene film capacitors are often used as capacitors that greatly affect sound quality. The coupling capacitor can be replaced with a large one with a maximum diameter of 22 mm and a length of 44 mm. ■ Volume setting for headphonesThe 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 stipulate strict temperature limits for each material of the housing. The temperature of the cover on the upper part of the output tube reaches a high temperature of nearly 100°C, so in order to comply with safety standards, polycarbonate is used for the bonnet, which has both heat resistance and robustness. Product Specifications● Vacuum tubes used: 300B (or 2A3) x 2, 12AU7 (or 12BH7A) x 2 ※Vacuum tubes are not included.* Below, unless otherwise specified, 300B + 12AU7 installed, with NFB, at 8Ω load ● Rated output: 8W + 8W (at 300B) / 3.5W + 3.5W (at 2A3)
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