Octave · Power Amplifiers

Jubilee Class A

The Jubilee Class A is a mono power amplifier running six KT120 tubes per side, delivering 160W of pure Class A power (280W in Class A/AB).

fig. 01 · power amplifiers

Jubilee Class A

current

From Octave

Six KT120 tubes power each Jubilee Class A monoblock, with KT150 or KT170 tubes available as alternatives. Output reaches 160W in pure Class A operation and up to 280W when High Power mode switches the amplifier into Class A/AB, giving it more headroom than a fixed Class A design without losing the tonal character of the circuit.

A touchscreen interface displays amplifier status and lets you switch between auto-bias presets for different output tube types, so changing tubes doesn't require manual bias adjustment. Frequency range runs 15Hz to 80kHz, with a 2-stage Low/High power preselection and a signal-to-noise ratio of -103dB.

RCA and XLR inputs are both selectable, feeding speaker outputs built for banana plugs and cable lugs. The Jubilee Class A sits between the MRE 220 SE push-pull monos and the Jubilee Mono Ultimate in Octave's power amplifier range, aimed at loudspeakers where bandwidth and dynamics need to pair with a smoother, more refined top end.

Specifications

Basic model	Jubilee Class A
Options	Remote power on
Design	Silver or Black, middle section in fine wood burl
Tube configuration	6 x KT 120; optional KT 150 or KT 170
Inputs	RCA + XLR selectable
Outputs	Speaker output suitable for banana plugs and cable lugs
Dimensions	240 x 640 x 420 mm (WxHxD)
Weight	65.0 kg
Eco Mode	Power saving mode
Protection System	Inrush current delay (soft start); Protection circuit for device and output tubes
Power Preselection	2-stage current adjustment, Low / High
Output power	160W in Class A mode / 280W in Class A/AB mode
Frequency range	15 Hz - 80 kHz
Harmonic distortion	< 0.1 % at 10 W on 4 ohms
Signal-to-noise ratio	-103 dB
Gain	+28 dB Cinch
Input sensitivity	1.5 V

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