Jubilee 300 B

The single ended monoblocks Jubilee 300 B are an absolutely modern and uncompromising implementation of probably the best reinforcement technology in the high-end sector. They enable the emotional, smooth, high-resolution, dynamic and spatial triode sound, not only in the mid/high range, but for the first time in a completely broadband range.


Design Color Middle section option


Our objective was to develop a 300 B amplifier that provides enough power for most speakers, while not interfering with the classic 300 B circuit. It was not about power for the sake of power, but about providing the 300 B with a perfect environment that enhances the tonal qualities of this tube.

The concept of a 300 B single-ended amplifier delivering 20 - 30 W 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 KT 88, KT 120, 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 300 B.

Octave's solution:

We have developed a 7 Hz power generator that supplies each of the three 300 B tubes with a separate, regulated 7 Hz pure sine wave heating voltage.

• This makes it possible to connect several 300 B 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 300 B be fully exploited. The 300 B 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.

Of course, the Jubilee 300 B has power management with soft start electronics, the protection system, a BIAS setting and display and the exclusive zero feedback technology. (See technology for description)


An exciting option for the Jubilee 300 B, the bi-amping package dramatically expands the application possibilities of these brilliant mono amplifiers, as even 30 pure Class A watt amplifiers will have limits.

If you wish to enjoy the seductive sound of triodes in very large rooms or with power-hungry speakers, it is often beneficial to control the bass region by utilizing a separate power amplifier for the low frequencies. However, such traditional bi-amping requires a level of customization, thus this optional package (which is not retrofit upgradeable) includes several important features to optimally integrate the Jubilee 300 B with the bass amplifier.

• The most important tool is a level adjustment to optimize the sensitivity of the Jubilee 300 B to the bass amplifier. With this controller you can perfectly integrate any amplifier into the system.

• Switchable Gain: one low and one high. This enables one to match the amplification factor of the Jubilee 300 B amplifier to the efficiency of different loudspeakers (for speaker models over 88 dB sensitivity – gain Low, or in case the level of the Preamp and the DAC is very high). This allows the volume control of the preamp to be used in the optimum range while also further reducing noise. In principle, all loudspeakers with sensitivities as low as 82 dB and greater than 106 dB can thus be perfectly driven.

• A low-cut filter that relieves the Jubilee 300 B of frequencies below 100 Hz. Of course, all functions are switchable. 
Another option for the Jubilee 300 B (also not retrofittable) is the remote function - A classic trigger that switches on the power amplifiers (with the pre-amp turned on).

General facts

Basic model Jubilee 300 B
Options Remote switching, bi-amping package
Design Silver or Black, middle section optionally available in various precious wood veneers
Tube configuration 3 x 300 B
Inputs 1 x RCA, 1 x XLR
Dimensions 240 x 660 x 400 mm (W x H x D)
Weight 55.0 kg
Outputs 4 and 8 ohms speaker outputs


Eco Mode Power saving mode
Power preselection 3-stage current adjustment, Low, Med, High - allows adaptation to alternative 300 B tubes
Bias Control separate BIAS display for 300 B
Protection System Inrush current delay (soft start); Protection circuit for device and output tubes
Heating system linear 7 Hz generator


Output power Selectable between 15 and 30 W
Frequency range 20 Hz - 50 kHz / -3 dB at full power
Signal-to-noise Ratio Gain High > 100 dB; Gain Low > 110 dB
Gain Gain High: 30 dB; Gain Low: 19.5 dB
Input sensitivity Gain High: 0.5 V; Gain Low: 1.7 V

Review 04/2023 - English version

"It delivers an extremely dynamic,energetic sound and, in addition, differentiates these two elements to an above-average degree. It also perfectly shows even subtle differences in color."

Poland - High Fidelity – April 2023

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Review 11/2021 - English version

"These power amps can really do it big, expansive, unlimited, authoritative and strong, and they can do it fine, romantic and colourful, but above all, they can do it all at the same time."

Germany – image hifi – November/December 2021

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Review 10/2019 - Hong Kong version

"Any reason for spending over HK$ 500,000 on a pair of 300 B valve power amplifiers? Majestic? Yes, there has never been an erected 300 B valve amplifier of such a gorgeous stature. To a great extent, a 300 B valve is a synonym of elegance and subtlety. Nevertheless, more importantly it enables me to hear and see further after having played with and auditioned it myself."

Hong Kong - HiFi review - October 2019

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Review 09/2019 - German version

"It is only to be expected that it is so much, as in this case in the fingers, to hand over an amplifier with praise. But the Anniversary 300 B is not of this world, but is rather located in an art of 300 B universe. "

Germany - stereoplay - September 2019

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