Within the production of the vacuum tubes, how to maintain the same value and sound of each of them?

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The most effective way is to control the filament voltage of the working tube.

This can be done when each of them has the same filament voltage, the tubes will have the same sound and consistent values.

The reason why Western Electric 300B could work stably with a sweet sound is that the production of filament was particularly good. each of the filaments is arranged in neat rows and average. Also, every tube has the same working voltage current and temperature.