Octave

Octave Jubilee 300B Monoblock Amps

Name: Octave Jubilee 300B Monoblock Amps
Brand: Octave
Price: 46000.00 USD
Availability: InStock

$46,000.00

Model #: Jubilee 300B

Available by request

The 300B tube is the most beloved audio component ever made. Warm, liquid, impossibly alive — and for decades, capped at about 8 watts. Octave changed that. Three 300B tubes per monoblock. A proprietary 7 Hz heating system no one else has. Up to 30 watts of full-bandwidth triode sound. This is what happens when a legend finally gets the engineering it always deserved.

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Description

Ask any serious audiophile what the greatest-sounding amplifier tube ever made is. The answer, almost universally, is the 300B. It's warm without being soft. Detailed without being clinical. Emotional in a way that solid-state has spent 50 years trying to replicate. The catch has always been power — traditional 300B designs top out around 8 watts, limiting what speakers they can realistically drive.

Octave spent years solving that problem. The Jubilee 300 B runs three 300B tubes per monoblock in a proprietary indirect-parallel configuration, pushing output to a selectable 15 or 30 watts. That alone would be impressive. But what makes this amplifier genuinely different is what's happening beneath the surface.

Each of those three 300B tubes gets its own dedicated 7 Hz pure sine wave heating voltage — a technology Octave developed specifically for this amplifier. Why does that matter? Because standard tube heating introduces ripple and RF interference that quietly degrades everything you hear. Eliminate it, and the 300B finally gets to do what it was always capable of: full-bandwidth, high-resolution triode sound from the bottom of the frequency range to the top. Not just magical midrange. All of it.

Zero feedback. Soft-start protection. Precision BIAS control and display. XLR and RCA inputs. Built the way Octave builds everything — with the conviction that the tube deserves a perfect environment, not a compromise.

If you've ever heard a 300B amplifier and thought "I wish it could do more" — this is your answer.

Sold as a pair.

Featured Specs

Tube configuration

3 x 300 B

Frequency Range

20 Hz - 50 kHz / -3 dB at full power

Input Sensitivity

Gain High: 0.5V; Gain Low: 1.7V

Zero Feedback

Amplifier stages without over-all feedback

General Specs

Depth (in.)

Height (in.)

Width (in.)

Product Weight (lbs.)

121.55

FAQs

Please read our FAQs page to find out more.

What is the warranty on Octave Products?

Octave offers a comprehensive warranty period for its products for a time period between 3-5 years. Consult your Definitive Expert with a more accurate warranty period for your specific product.

Do you offer service on Octave Products?

We do! In many cases we can service a still under warranty products in the home, however in rare cases we might need to bring it in for more extensive maintenance.

Do you accept trade-ins toward purchase?

Absolutely. We have an aggressive trade in program aimed at getting our clients to the next level. Ask one or our experts about it or submit your potential trade in gear here.