The KR300B is an ultra-linear, low frequency, high power triode tube capable of  producing 15 watts of pure class-A power. This tube features a new ribbon filament  construction and the KR Enterprise exclusive patent design with 32 cathodes.  The KR300B possesses a vacuum of 10(-8) Torr, a maximum grid current of 2.0 microamperes and absolutely constant emission over the life of the tube. All KR Enterprise tubes are warranted for a period of 2 years.

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