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.

Neon Trees

Tyler Glenn: lead vocals keyboards Chris Allen: guitars Branden Campbell: bass Elaine Bradley: drums vocals "I wanna shake up your system I wanna rattle your bones I wanna take you to the stars And then I'll leave you alone." "Farther Down" Like their name, Neon Trees are a combination of slick pop hooks and sturdy organic rock, both melodic and hard-hitting, their anthems of adolescent angst, longing, love lost and found, delivered with the kind of heart-on-the-sleeve passion that only comes from hard work and commitment. Their Mercury Island Def Jam debut, Habits, produced by Tim Pagnotta, is a refreshing blast of timeless rock energy and spirit that wouldn't sound out of place at any point from'60s garage-rock to 2010 dance rock, with the first single, "Animal," taking off from a round of weaving, angular guitars into a song equally at home in the arena as on the dance floor, a paean to sexual longing in which singer front man Tyler Glenn wails, "Take a bite out of my heart tonight....

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