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KR Audio 2A3 Clear Glassoutput tube）
KR's 2A3 has honed the "closeness of breathing" typical of 2A3 through information prospects and low-frequency arrangement
The 2A3 is a sphere that has a modest output but straight up the sound and the density of the midrange. It is a single A-class circuit, and it is strong in the direction of "adjusting and bringing forward" the texture of the voice and strings rather than "fattening". The intensity of the presence when the speaker hits cannot be described only by the output wattage.
KR AUDIO 2A3 puts "modern construction" into the 2A3. The monoplate structure is combined with a new ribbon filament and a patented design of 32 cathodes, with a vacuum level of 10^-8 Torr, a maximum grid current of 2.0 μA, and constant emissions throughout life.
In terms of output, we assume a typical 2A3 single-A class of 3-5 W, with a typical example of approximately 4.0 W (THD <0.5%, 2.5 kΩ load). It is for those who want to focus on the organization of low frequencies and the sound field rather than flashy extrusion. The heater is a 2.5V system and the current is 2.5A. Even if the 2A3 compatible amplifier is designed without room for heater current, it is easy to become unstable, so it is safe to check this first.
| Filament voltage | 2.5V（±5%） / 2.5A |
|---|---|
| Basic characteristics (amplification rate) |
3.8 |
| Representative Action Points (A1 Class) Va / Ia / Vg | 250V / 70mA / -45V |
| Representative action points (A1 class) | 5.2mA/V / 750Ω |
| Maximum current | 100mA |
| Maximum plate voltage | 350V |
| Maximum plate loss | 20W |
The KR Audio 2A3 primarily focuses on the quietness of the background and its ability to capture very small signals. Subtle nuances are not lost, and the contours of the sound image remain clear and well-defined. Strings extend with a silky texture, and woodwinds convey the 'texture of wood' prominently, with harmonics remaining intact and a sense of clarity enhanced. The bass is not built up in quantity but gains firmness and discipline, tightening the foundation. Although it is not a type that overwhelms by wattage, in actual listening, it feels as if the presence and punch have increased, working to elevate the transparency of the amplifier a notch higher.
