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.

The Airborne Toxic Event

ldquo When I write a song," says Mikel Jollett, co-founder and creative driver of the Californian five-piece The Airborne Toxic Event, "I'm trying to get down an emotion, a scene or a setting. Everything important that happens after that happens between the music and the listener the rest of it is all mythology. The collective interpretation of it is way more important than what I think." There's no reason to doubt the truth of that statement. Except that Jollett does do a lot of thinking (or over-thinking, as he himself would put it), and what he does, the way he spends his days, matters to him deeply. Besides, he's had a lot to think about in the two years since the band's debut album ambushed and enraptured fans with its captivating blend of literate, visceral indie rock and propulsive, anthemic choruses. That self-titled album which topped Billboard's Heatseeker Chart for an astounding 8 weeks, found Jollett addressing the break-up of a relationship with a candour that was sometime...

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