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ELEKIT TU-8900 SE TUBE AMPLIFIER KIT ( N0 TUBES)
$2,500
Directly-heated triode tubes like the 300B and 2A3 enjoy an enduring popularity among audiophiles. The 300B with its rich
midrange and extended bass - and 2A3 with its delicate expression and gentle tone - they offer a very special sonic experience. These
2 tubes, similar in appearance but very different in characteri stics, can both be used in TU-8900 without any special changes in
amplifier settings. Many manufacturers are producing 300B and 2A3 tubes so users can enjoy trying the various versions available
in the market.
■ Automatic detection of 300B and 2A3 tubes
“300B” and “2A3” tubes look similar but their respective filament voltages and operating
parameters are totally different. Their supply voltages need to be adjusted depending on
which of these tubes are used in the same amp. In TU-8900, the tubes installed are detected
automatically and the correct filament voltage and voltage of B-power are automatically set.
When 300B tubes are installed, the LEDs on the sides of the volume knob will light up in
blue. If 2A3 tubes are installed, the volume knob LEDs will light up in green. Additionally,
these LEDs on the right and left side of the volume knob will turn red when there is excessive
current due to defective tubes, etc., and the current is shut down to protect the amplifier. The
red LEDs will also diagnose the problematic tube- the right side of the volume knob turns red
when excess current occurs in the right channel, and vice versa .
■ Tube-friendly design
Warm-up time for directly-heated tubes and indirectly-heated tubes are different. In most designs,
directly-heated tubes warm up faster than indirectly-heated tubes. So directly-heated tubes are
often overloaded. With TU-8900, the voltage is gradually raised and reduces the level of overload
to the directly-heated tubes
●Stock tubes :300B (or 2A3) x 2pcs, 12AU7 (or 12BH7A) x 2pcs (Tubes not included)
* Specifications below are with the 300B 12AU7, with NFB, 8Ω loaded
●Rated output :8W 8W (300B) / 3.5W 3.5W (2A3)
●Rated input : 1Vrms (300B) / 650mVrms (2A3)
●Residual noise : 15μV (IHF-A)
●Frequency response : 7Hz-90kHz (with NFB) / 12Hz-45kHz (Without NFB)
●Input impedance : 50kΩ
●Output impedance : 4-6.3Ω, 8-16Ω (SW on backside)
midrange and extended bass - and 2A3 with its delicate expression and gentle tone - they offer a very special sonic experience. These
2 tubes, similar in appearance but very different in characteri stics, can both be used in TU-8900 without any special changes in
amplifier settings. Many manufacturers are producing 300B and 2A3 tubes so users can enjoy trying the various versions available
in the market.
■ Automatic detection of 300B and 2A3 tubes
“300B” and “2A3” tubes look similar but their respective filament voltages and operating
parameters are totally different. Their supply voltages need to be adjusted depending on
which of these tubes are used in the same amp. In TU-8900, the tubes installed are detected
automatically and the correct filament voltage and voltage of B-power are automatically set.
When 300B tubes are installed, the LEDs on the sides of the volume knob will light up in
blue. If 2A3 tubes are installed, the volume knob LEDs will light up in green. Additionally,
these LEDs on the right and left side of the volume knob will turn red when there is excessive
current due to defective tubes, etc., and the current is shut down to protect the amplifier. The
red LEDs will also diagnose the problematic tube- the right side of the volume knob turns red
when excess current occurs in the right channel, and vice versa .
■ Tube-friendly design
Warm-up time for directly-heated tubes and indirectly-heated tubes are different. In most designs,
directly-heated tubes warm up faster than indirectly-heated tubes. So directly-heated tubes are
often overloaded. With TU-8900, the voltage is gradually raised and reduces the level of overload
to the directly-heated tubes
●Stock tubes :300B (or 2A3) x 2pcs, 12AU7 (or 12BH7A) x 2pcs (Tubes not included)
* Specifications below are with the 300B 12AU7, with NFB, 8Ω loaded
●Rated output :8W 8W (300B) / 3.5W 3.5W (2A3)
●Rated input : 1Vrms (300B) / 650mVrms (2A3)
●Residual noise : 15μV (IHF-A)
●Frequency response : 7Hz-90kHz (with NFB) / 12Hz-45kHz (Without NFB)
●Input impedance : 50kΩ
●Output impedance : 4-6.3Ω, 8-16Ω (SW on backside)
- Date Listed:14/07/2021
- Last Edited:15/11/2022
- Condition:New
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