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.

Slash

ldquo It's been an interesting road from the mid 90s up until now," says Slash. "I never stopped to think,'What am I gonna to do in the long term?'Or ruminated on my solo career, where it was heading. I've just been jamming around, going wherever the muse has taken me. And this is the first time where I feel like I'm in the saddle and riding my own destiny with some genuine focus." For fans who've tracked the broken glass and ruby slipper journey of Guns N'Roses lead guitarist since the release of Appetite for Destruction two days before his 22nd birthday 25 years ago this July, one can't help but be radioactive with enthusiasm. Apocalyptic Love is not just a new record by the storied musician with the black top hat and magical gift for riff, for Slash and his three co-conspirators it is, indeed, destiny. And everyone involved is poised for the ride. "The entire album was recorded like a live performance record where the band was all set up together in the big room," observes producer ...

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