Guitar.com: Much more harmonic distortion is acceptable in guitar amp tubes than in hifi tubes – is this lower-fidelity sound reflected in the ease of the manufacturing process?
Western Electric: “There is a need for better quality. This is yet another major reason we would even consider breaking into the guitar amp tube market. People have grown accustomed to cherry-picking from any given batch of tubes to get the best sound. Along with better reliability, we hope to offer a super low-noise, low-distortion, and consistent product people can trust. Our goal has always been to make the best electron tubes in the world.
“That being said, yes, manufacturing a miniature dual triode like the 12AX7 is significantly easier and less labour-intensive than a 300B, for example.”
I guess we’ll just have to wait and see how they sound and what they cost.