Ray Tubes

Ray Tubes RESERVE 300B Vacuum Tube

Name: Ray Tubes RESERVE 300B Vacuum Tube
Brand: Ray Tubes
SKU: 300B/RES
Availability: InStoreOnly

SKU:

300B/RES

$679.00 - $2,899.00

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Description
Specs
Dimensions
About Ray Tubes
Warranty

Description

RESERVE 300B

The Ray Tubes RESERVE 300B is the distillation of decades of experience. With a bespoke design, small-batch production, and meticulous selection, the Ray Tubes RESERVE Collection reveals audio details you never knew were there.

Hand selected and tested, the Ray Tubes RESERVE 300B is designed specifically for hi-fi audio applications. Featuring gold-plated pins and our monocrystalline carbon Magic Coating, the RESERVE Collection easily outperforms New Old Stock and new production alike. Fewer than 5% of production meets our standards.

The 300B is a legendary tube. Introduced in 1938, it powered the cinemas of Hollywood’s Golden Age. Audiophiles have treasured it for decades for its low noise and good reliability. Ray Tubes is proud to introduce our take on a classic.

Sound Characteristics

The RESERVE 300B delivers warm and elastic low frequencies, delicate and layered midrange, clear and smooth high frequencies, and rich details. Its moderate dynamic range and wide, well-defined soundstage offer a good sense of space and clarity.

Bass Performance

Warm and elastic, offering a delicate and textured low-end ideal for genres like jazz and folk.

Midrange Performance

Full-bodied and emotional, particularly in vocals and strings, with transparent and rounded sound showcasing rich layering and warmth.

Treble Performance

Clear with an airy feel, smooth and detailed, presenting rich nuances with a natural and gentle sound that avoids excessive brightness.

Dynamics and Soundstage

Moderate dynamic range effectively highlights contrasts in loud and soft passages. Soundstage is wide and well-defined, with excellent depth and space, making it suitable for smaller ensemble music.

The RESERVE Collection

The Ray Tubes RESERVE Collection isn't for everyone. It’s the distillation of decades of experience. With a bespoke design, small-batch production, and meticulous selection, RESERVE reveals audio details you never knew were there.

Engineered Exclusively for High Fidelity Audio

We took everything we learned from developing our CORE and SELECT lines and asked ourselves a simple question: what’s missing from the tube marketplace? Our answer is the RESERVE Collection—tubes designed from start to finish with hi-fi audio in mind. No shortcuts, no cut corners, no expense spared.

Product development is an iterative process. The best way to meet the needs of our partners and customers is to engage with them and learn from them. Our RESERVE tubes are the pinnacle of that process.

Bespoke Design and Small-Batch Production

We’ve pulled out all the stops for the RESERVE Collection. Every step of the production process is fine-tuned to ensure the highest quality possible. It’s tricky, painstaking work, which is why we can only make RESERVE tubes in small quantities—but it’s worth it.

First we optimize the design of each tube’s glass bulb to improve heat dissipation and longevity. Next, we use only high-purity metals in the tube’s construction, which minimizes the likelihood of flaws that could impact sound quality or even cause tube failure. When it’s time to put the "vacuum" in vacuum tube, we take our time removing the air. For most tubes, this step is very quick, and that’s good enough — but RESERVE isn’t about good enough. We take our time.

Finally, we apply our Magic Coating. This is a layer of monocrystalline carbon that improves electron flow, helps with heat dissipation, and blocks out noise. The end result? Tubes that sound better, longer.

Unparalleled Quality Control

We put our RESERVE tubes through the wringer to ensure quality and consistency. That’s why we offer the Ray Tubes One Year Warranty against any and all manufacturing defects, and why you can enjoy total peace of mind.

The quality control process for our RESERVE tubes is as meticulous as every other aspect of their production. Each tube is assigned a unique identifier that allows us to track it through a series of tests. If the tube fails a single test, it doesn’t make the cut.

From the soldering onwards, our engineers put the tubes under a microscope — literally. We know how frustrating it is when a tube doesn’t behave as expected or fails outright, and we’re committed to making frustration a thing of the past. That’s what peace of mind is all about.

More Details

The Ray Tubes One Year Warranty

Most vacuum tubes are notoriously fickle. That’s why warranties are rare. But we trust our products and we’re proud to offer our One Year Warranty against manufacturing defects. Click here for details.

Compatible Amps

Click here to explore Ray Tubes' Tube Amp Compatibility List.

Package Contents

Set of four, two, or single vacuum tube
User handbook featuring burn-in guidelines
Certificate of authenticity and warranty

Technical Specifications

Tube Type: 300B
Tube Socket: 4-pin
Power Output (Pout): 6.6 W

Filament Specification

Filament Voltage (Uf): 5 V
Filament Current (If): 1.2 A

Maximum Rating

Anode Voltage (Ua): 480 V
Anode Dissipation Power (Pa): 40 W

Cathode Current (Ik)

Self Bias: 100 mA
Fixed Bias: 70 mA

Interelectrode Capacitance

Input Capacitance (Cin): 9 pF
Output Capacitance: 4.3 pF
Transfer Capacitance: 15 pF

Static Parameters

Anode Voltage (Ua): 300 V
Grid Voltage (Ug): -60 V
Anode Current (Ia): 60 mA
Transconductance (Gm): 5.5 mA/V
Internal Resistance (Ri): 0.7 kΩ
Amplification Factor (μ): 3.85

Specs

Dimensions

About Ray Tubes

Warranty

The Ray Tubes One Year Warranty

This warranty covers manufacturing defects for twelve months after purchase. We believe that everyone who buys our tubes deserves at least a year of quality, hassle-free sound, and if our tubes get in the way of your bliss, we'll make it right. Click here for more details.