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.

Darkest Hour

Some metal bands barely last 10 years, much less 15 years. If a band does get to the decade-and-a-half mark, they're usually sputtering out or are teetering on their last, diseased and ready-to-give out legs. Rare is the case where an aggressive band mutates, growing stronger, more unstoppable and more menacing with every passing riff, scream and album. Darkest Hour are such a case. The Human Romance is the Washington, DC-based band's seventh album and first for new label eOne. It presents Darkest Hour at their best: fangs bared and ready to pounce through the vehicle that blends thrashy melodic metal with something unworldly. With their long tenure on Victory Records in the rear view, Darkest Hour are primed to reinvent themselves. "The band is a more grown up version of what it was," guitarist Mike Schleibaum says. "It's hard to pinpoint what'grown up'means exactly, but we know what the difference is." The fans will know it when they hear it, too. "Growing up" does not mean "watered ...

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