Ray Tubes SELECT 300B
The 300B is a legendary tube. Introduced in 1938, it powered the cinemas of Hollywoodʼs 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.
SELECT 300B- Product Highlights
The Ray Tubes SELECT Collection offers the best tubes youʼll ever need. It goes above and beyond the baseline to bring out the best in all your
favourites.
● Designed and manufactured by a team with decades of experience
● Hand-selected by engineers, only the top tubes make the cut
● Gold pins for durability and longevity
● Substantially more consistent performance than New Old Stock
● Unlike NOS and most other new production, covered by the Ray Tubes
One Year Warranty
SELECT 300B- Sound Characteristics
The SELECT 300B captures the heart of what makes the 300B tube legendary—lush mids, graceful highs, and a coherent, musical bass foundation.
● Bass is controlled and cohesive, with moderate extension and just the
right amount of body. Ideal for genres like acoustic, jazz, and classical.
● The midrange is where the SELECT 300B truly excels. Rich, full-bodied
tonal character with a touch of warmth. Vocals are especially well
rendered, from baritone to soprano.
● Delivers the characteristic smoothness of the 300B, with a layered treble
extension and a natural sense of sparkle. A soft warmth in the upper
register gives strings and female vocals a refined presence.
Our Quality Control
Our Quality Control Each tube undergoes a seven-step quality control process, including a 24-hour burn-in period, stress tests to minimize microphonics, and critical parameters that are carefully measured to ensure consistency and accurate matching. Finally, sound engineers assess each tube under real-world listening conditions.
By the end of the quality control process, only 5% of tubes commissioned for production meet Ray Tubesʼ standards.
Our Warranty
Books have been written about the countless ways vacuum tubes can and do fail. With most manufacturers, and all New Old Stock, a tube failure leaves the user high and dry. Ray Tubes is different. All Ray Tubes products are backed by the Ray Tubes One Year Warranty, which covers manufacturing defects for twelve months from the date of purchase.
SELECT 300B Specifications
|
Specification |
Value |
|
Tube Socket |
4-pin |
|
Filament(Heater) Ratings |
Filament Voltage: 5V Filament Current: 1.2 A |
|
Maximum Ratings |
Plate (Anode)Voltage: 480 V Plate Dissipation: 40 W |
|
Typical Operating Conditions |
Plate Current(Self-Bias):100mA Plate Current(Fixed Bias):70mA |
|
Interelectrode Capacitance at Zero Bias |
Input Capacitance: 9 pF Output Capacitance: 4.3 pF Transfer Capacitance: 15 pF |
|
Static Characteristics (under typical conditions) |
Value |
|
Plate Current (1a) |
60 mA |
|
Transconductance (Gm) |
5.5 mA/V |
|
Plate Resistance (Rp) |
0.7 kΩ |
|
Amplification Factor (μ): |
3.85 |
|
Output Power (Pout) |
6.6 W |
ThomasAndStereo
Ray Tubes Select/Reserve 300B
