Our objective was to develop a 300B amplifier that provides enough power for most speakers, while not
interfering with the classic 300B circuit. It was not about power for the sake of power, but about providing
the 300B with a perfect environment that enhances the tonal qualities of this tube.
The concept of a 300B single-ended amplifier delivering 20-30W output power with three power tubes in
indirect parallel operation was thus born.
There is a fundamental problem regarding "direct" heating of the triodes:
Unlike indirectly heated tubes (such as the KT88, KT120, etc.), directly heated triodes cannot operate directly
in parallel because of the complex demands on the heating system needed increase output power.
The typical 50 Hz AC heater voltage would cause unacceptably high hum and power disturbances in the
speaker. Although DC heating eliminates the hum, it also limits the sonic potential of the 300B.
We have developed a 7 Hz power generator that supplies each of the three 300B tubes with a separate,
regulated 7 Hz pure sine wave heating voltage.
• This makes it possible to connect several 300B tubes in parallel.
• Sound-affecting ripple and RF disturbances of the line frequency are completely eliminated.
• Heating and operating voltage are electronically controlled, sound instabilities due
the fluctuating mains voltage is a thing of the past.
• Only then can the tonal potential of the 300B be fully exploited.
The 300B tubes will now operate in the optimized region and can fully develop their tonal qualities.
Now it becomes clear why she is called the "queen" of tubes.
Thus, the Octave Jubilee 300 B is an absolutely modern and uncompromising implementation of arguably
the finest amplification technology in the high-end sector. The amp offers an emotional, smooth, highresolution,
dynamic and expansive triode sound, not only in the mid/high frequency range, but for the first
time, completely across the full audio band.
Jubilee 300 B, a new generation of single ended amplifier technology without limitations.