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.

Ronnie Ficarro / Falling in Reverse

At the age of 12 I got my start by picking up my fathers bass playing 60'S music i had taught myself . At 14 I was given the album Dookie (Green Day) by a student teacher in my 7th grade science class. Mike Dirnt became my biggest influence mentor and At that moment I knew I wanted to be a bass player in a rock band and tour the world. After a decade of touring in independent punk rock, rock, and pop projects I got an opportunity to step in on Bass for Falling In Reverse in Jan 2012.

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