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.

Yolihuani/ RADAID / Fesway

"Strength, sound, fidelity and the feeling generated by a tube amplifier have no comparison whatsoever. Groove Tubes Fender!" From early childhood he started to study music going through different instruments like the violin, O d, classical and flamenco guitar. He has studied and explored Indian classical music through the sitar with Professor Michael Robbins and Pandit Nayan Ghosh. Over the years it was the electric guitar what captured his attention the most and he consolidated his sound with Fender guitars, always accompanied by his favorite amps, the Fender Hot Rod's which provide great sound thanks to its Groove Tubes. His band, RADAID (World Music Fusion), has four studio recordings: "Radaid" (2003), "Luz Escondida" (2006), "L'intent" (2009) y "The Willing" (2012) also a live DVD recorded at the Lunario of Auditorio Nacional in Mexico City called "L'intent Viu" (2010). He also had important presentations with Radaid throughout Mexico and different forums and festivals of the Unit...

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