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 Chelle Rae

Before Hot Chelle Rae "fueled up the Jeep with bubbly elasti-funk and breezy hip-hop swagger" (as Entertainment Weekly put it) with their brand new single "I Like It Like That," the Nashville-based quartet scored a bonafide breakthrough smash hit over the last several months with "Tonight Tonight." Declared "one of the catchiest pop-rock anthems of the summer" by USA Today, "Tonight Tonight" crashed into the Top 10 on the Billboard Hot 100 chart in July like an unruly teenager, shot to No. 1 at Hot AC radio in September, was certified double-platinum in the U.S., and certified platinum in Canada and Australia. Meanwhile, its hilarious video (featuring a cameo by guitarist Nash Overstreet's brother, Glee's Chord Overstreet) has racked up nearly 30 million views online, energizing the group's active, devoted fan base. But it wasn't until Jon Stewart sang a snippet of its chorus on The Daily Show that the band realized just how thoroughly "Tonight Tonight" had penetrated the mainstream. "...

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