Octave Jubilee 300 B Single-Ended Mono Power Amp Pair

Description

New for 2023.

Octave’s 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.

Octave’s solution:

They 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 optimised 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, high resolution, dynamic and expansive triode sound, not only in the mid/high frequency range, but for the first time, completely across the full audio band.

Features

• Regulated electronic power supply instead of a choke power supply
• Power generator for triple 7 Hz heating voltage with pure sine wave
• Energy management for supply and heating voltage to extend the lifetime of tube and amplifier
• Protection and overload system to protect the tubes and the amplifier against tube damage and operating errors
• Adjustable BIAS levels to allow the use of different 300 B-tubes: low, medium and high (equivalent to 25mA, 50mA and 70mA quiescent current per 300B)
• BIAS meter for controlling the three output tubes
• Speaker output terminals for 4 and 8 ohm speakers
• Trigger/remote switching is optional

Technical Specifications

Manufacturer Site

• Octave