Many folks who buy our tubes know that we use a special process to categorically rate our tubes so that players can select the tubes that best fit their preferred tones and styles. However, we get a lot of questions about our rating system, and what the numbers actually mean.

IMPORTANT BIAS NOTE: If you're replacing a tube with the SAME TYPE of Groove Tube (tube model and rating), you do not have to rebias your amp. In any other case, you should always have a qualified amp tech reset your amp’s bias whenever changing your tube type or rating number.

low

1-3

Early distortion, wide range, softer attack good for Rock and Blues solos.

Medium

4-7

Normal performance, great dynamic range/attack and best all around rating type for all styles of playing

High

8-10

Most dynamic range, most clean power/less break-up for power players, Jazz and bass amps.

Hot Water Music

If you ask the members of Hot Water Music what it's like to be back, the musicians will tell you that it doesn't feel like they've gone anywhere. And it's understandable why: The rock foursome, which formed in 1993 in Gainesville, FL, has been a staple of the music scene for years. The band's new album, Exister, is their eighth in nearly two decades, yet another addition to an already impressive career. But it's also understandable why fans see this album as a sudden return: The group, singer guitarist Chris Wollard, bassist Jason Black, drummer George Rebelo and guitarist vocalist Chuck Ragan, pressed pause in 2006, electing to pursue individual projects and live their lives for a while. In the long run, that break worked - two years later the four members reconvened to perform live, a few shows evolving into many. The band's desire to pen a new album to succeed 2004's The New What Next rose directly from those live shows. "The more shows we did, the more we felt like a band," Chris s...

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