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A pleasure different from 300B. Into the world of PX4
The low frequencies are more contour than quantity. The midrange is more real than thick. The aftertaste is long and natural.
It is an option that can obtain the density and afterglow unique to PX4 as a "usable ball" with the perfection of current production.
The PX4 is a direct heat triode that can draw the core of the sound and the atmosphere thicker than pushing it through with the output. The texture of the vocals and strings does not fade, and the outline of the sound image stands up without swaying. This "density method" is the most attractive thing about PX4. It can be assumed that it can be used for Class A amplifiers with a maximum of 3 to 6 W, and depending on the configuration,output tube/ As a driver tube, you can take advantage of the taste of PX4.
Precautions for use
PX4 has clear numerical conditions. The filament is 4V (±5%)/1.1A, and the amplification factor is 5.0. The maximum rating is 350 V plate voltage, 60 mA plate current, and 20 W plate loss. Typical conditions for A1 class are Va 250V, Ia 48mA, Vg −32V, mutual conductance 5.1mA/V, and plate resistance 980Ω. It is safe to check whether the heater conditions on the amplifier side and the operating point match before installation.
| Filament voltage | 4V（±5%）/1.1A |
|---|---|
| Basic characteristics (amplification rate) | 5.0 |
| Representative Action Points (A1 Class) Va / Ia / Vg | 250V / 48mA / -32V |
| Representative action points (A1 class) | 5.1mA/V / 980Ω |
| Maximum current | 60mA |
| Maximum plate voltage | 350V |
| Maximum plate loss | 20W |
The KR Audio PX4 is strong in that it has a high density. The core of the sound does not become thin, and the feel is organic, resulting in a refined cohesion. While it is not as agile and precise as the 300B, it can still be said that it is a different way of perceiving it as music.
In addition, the attenuation sound (disappearing) will swing in the direction of the space, and the aftertaste will be clearly expanded. This is interpreted differently depending on whether it is taken as "the growth of spatial expression" or "the presence of microphonic".
The PX4 is more dynamic than the 300B series, and it is a type that moves forward with a rise and outlook rather than pushing with a strong impact and clarity.
