Ray Tubes Reserve 300BRay Tubes Reserve 300B The 300B is one of the most important tubes in the history of audio. Introduced in 1938 for theater sound amplification, it found its way into audiophile systems in the 1990s and has not left. Low noise, good reliability, extraordinary midrange quality and an unmistakable presentation that listeners either find essential or find too colored, with relatively little middle ground. If you run a SET amplifier, you've already

Ray Tubes Reserve 300B

The 300B is one of the most important tubes in the history of audio. Introduced in 1938 for theater sound amplification, it found its way into audiophile systems in the 1990s and has not left. Low noise, good reliability, extraordinary midrange quality — and an unmistakable presentation that listeners either find essential or find too colored, with relatively little middle ground. If you run a SET amplifier, you've already committed to the 300B's character. Getting the best possible new-production version is the right next step.

The Ray Tubes Approach

Ray Tubes builds to their own specifications rather than licensing production from existing facilities. QC includes electrical testing and listening evaluation by sound engineers — every batch, not spot checks. The Reserve designation indicates tubes selected from production at the tightest tolerances, with the most consistent measured performance from the batch.

Our Take

We've evaluated several current new-production 300B options. The Ray Tubes Reserve is among the best we've heard from a new-production perspective — the midrange has the characteristic 300B liquidity without the softness that can make some new-production versions sound sluggish compared to NOS. The bass is more controlled than some alternatives, which matters in amplifiers where the 300B is working hard into a lower impedance load.

Press Recognition

Ray Tubes is a newer brand. Extensive press coverage doesn't yet exist. Our evaluation and customer feedback in SET amplifier systems — including Sophia Electric and Triode Corporation designs — has been consistently favorable.

Specifications

• Type: 300B triode
• Application: Single-ended triode amplifiers, output stage
• Production: New production to Ray Tubes specifications
• Quality control: Electrical testing plus listening evaluation
• Tier: Reserve
• Pricing: Per pair

Questions about 300B selection for your specific amplifier, or comparing Reserve to Select for your application? Reach out.