Description
The RESERVE 300B delivers warm and elastic low frequencies, a delicate and layered midrange, and smooth treble, all married to rich detail and a wide, exceptionally well-defined soundstage.
- The bass offers a delicate and textured low-end ideal for jazz and folk.
- The midrange frequencies are full-bodied and emotional, particularly in vocals and strings, with warm and richly-layered sound.
- The treble performance is clear and airy, presenting rich nuance with a natural and gentle sound.
- The dynamic range effectively highlights contrasts in loud and soft passages, while the soundstage is wide and very well-defined with excellent depth and space.
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.
The Ray Tubes RESERVE Collection isn’t for everyone. It’s the distillation of decades of experience. RESERVE reveals audio details you never knew were there.
- Bespoke design and small-batch production
- Hand-selected by engineers to our most meticulous standards
- Higher quality materials, including gold pins for longevity
- Monocrystalline carbon Magic Coating for improved heat dissipation
- Substantially more consistent performance than New Old Stock
- Covered by the Ray Tubes One Year Warranty
Dimensions and pinout

Package Contents
- Set of one, two or four vacuum tubes
- User handbook featuring burn-in guidelines
- Certificate of authenticity and warranty






