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KR AUDIO 300B(WE Clone)Direct Heat 3-Poleoutput tube
With the "density and afterglow" of 300B as the core, the balloon-type 300B comfortably raises the scale and outlook
The appeal of the 300B is that the texture of the voice and strings does not fade, the core of the sound image does not collapse, and the aftertaste naturally develops. The 300B-Balloon is organized in the direction of preparing the information outlook and low-frequency foothold without deviating from its royal road. It is suitable for those who emphasize the "closeness of music" of single A-class while also wanting a wide range and a sense of scale.
KR AUDIO positions the 300B as a "high-power triode that is strong in low frequencies" and specifies the ribbon filament structure and patented design of "32 cathodes". The vacuum level is 10 (-8) Torr, the maximum grid current is 2.0 μA, the emission is constant until the end of the life, and the warranty is 2 years.
The balloon shape doesn't just look special. Its presence on the top plate stands out, enhancing the overall system impression. The 300B is a category that is as effective as "sound" for "ownership and daily satisfaction", but the 300B-Balloon is one that plays a leading role, including that part.
Regarding compatibility, it has been clarified on the distribution side that it can be used as a replacement for the classic 300B. You can assume that you will replace it with a 300B compatible amplifier, but be sure to check the heater capacity (1.2A margin) and bias conditions.
| Filament voltage | 5V（±5%） / 1.2A |
|---|---|
| Basic characteristics (amplification rate) |
3.9 |
| Representative Action Points (A1 Class) Va / Ia / Vg | 550V / 120mA / -90V |
| Representative action points (A1 class) | 6.2mA/V / 630Ω |
| Maximum current | 120mA |
| Maximum plate voltage | 550V |
| Maximum plate loss | 50W |
The KR 300B-Balloon emphasizes its ability to capture subtle details. However, it does not exaggerate the amount of information in a way that makes the treble appear brighter. The texture and tone remain intact, preserving a natural feel, while improving clarity and perspective. Even as the detail increases, the sound does not become hard, and the flow of the music is not interrupted — this is the main focus.
The comparison centers on the width and depth of the soundstage, and how well the sound holds up under complex pieces. The KR tends to offer a wide and deep stage with good separation, while maintaining coherence even during busy sections. In contrast, TJ Mesh is often praised for the lush mid-to-high bloom, but that bloom can sometimes mask fine details. The KR, however, does not add appeal with bloom, but rather balances the overall sound for a natural listening experience.
The bass is described with the keywords 'discipline,' 'attack,' and 'depth,' presented as well-controlled output. The review also mentions a cohesiveness akin to push-pull operation. The midrange retains the classic 300B tone and harmonics, with added agility and impact. The treble has a firm core yet remains unruly-free, enhancing the attack and realism of percussion — this is how the overall sound is constructed.
