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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 comes to the fore with its ability to pick up minute information. However, the amount of information is not exaggerated in the direction of "brightening the high frequencies". It is a depiction that does not dilute the texture or tone, but only increases the perspective while maintaining a natural feel. The sound does not become stiff even as the details increase, and the flow of the music does not stop - this is the main focus.
The axis of comparison is the breadth and depth of the sound field, and the difficulty of collapsing in complex songs. KR has a wide and deep stage, so the separation is good, but it is difficult to break the overall cohesion even in busy parts. On the other hand, TJ Mesh tends to be talked about as attractive for its glossy "bloom" in the mid and high frequencies, but there are scenes where the bloom covers the details. KR is not written to add sex appeal with bloom, but to arrange the whole thing and land it in a place where it can be heard naturally.
The low frequencies are talked about as a well-organized way with the keywords "discipline", "attack", and "depth". Another feature of this review is that there is an expression that it is close to push-pull. The midrange maintains the tone and harmonics typical of the 300B, while adding good movement and impact. The high frequencies have a hard core but are not rough, and the rise of the percussion instruments and the reality of the tips increase—the overall picture is assembled in this way.
