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.



Early distortion, wide range, softer attack good for Rock and Blues solos.



Normal performance, great dynamic range/attack and best all around rating type for all styles of playing



Most dynamic range, most clean power/less break-up for power players, Jazz and bass amps.

Roger Clyne / Roger Clyne & The Peacemakers

Roger Clyne The Peacemakers (RCPM) are proof that the crazy, reckless, restless, swaggering soul of American rock is still burning a hole in the night sky ... guitars blaze, quake and quiver, drums slip, thud and thunder with killer melodies and hooks and the occasional reggae or mariachi rhythm laced through the middle to keep it all honest and interesting." - Tom Jurek, Paste magazine Roger Clyne The Peacemakers - Roger Clyne, drummer P.H. Naffah, lead guitarist Jim Dalton and bassist Nick Scropos - is the only independent band to debut in the top ten on the Billboard Internet Sales chart for six consecutive albums, including two number one entries.Clyne and Naffah enjoyed an accomplished stint with late-'90s rock band the Refreshments, whose cult-classic albumFizzy Fuzzy, Big Buzzy produced hit singles "Banditos" and "Down Together." The Refreshments also performed the Clyne-penned theme song for Fox television animated hit series King of the Hill.Clyne The Peacemakers stepped up to...

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