All Fender® Tube Amps come Factory Equipped with Groove Tubes. They are much easier to replace (no re-biasing needed when replaced with color coded sets). They have improved harmonic balance, longer lifespan, matched gain to distortion ratio, plus a wider frequency response.  

12AT7. Used for phase inverters in many amps such as Fender Black and Silver Face, reverb drivers, etc. This tube is used widely in most of the US-made amps and, in particular, the Fender amps. Fender amps with reverb use two 12AT7s - one for the reverb drive stage, and one used as a phase inverter to drive the push/pull…

A Chinese version of the 12AX7-C. Great for Marshalls and Fenders. Sweet warm mid range tone, complements tone of European amps. A tube that takes some of the edge off of high gain amps by reducing the brightness while still having the gain and articulation. For those that change first stage gain preamp tubes to change the taste and…

Groove Tubes has been manufacturing, importing, and grading quality power tubes for two decades. No stranger to Sweetwater, Groove Tubes founder and energy source Aspen Pittman has paid us numerous informative (and always entertaining) visits through the years. His tireless pursuit of perfect tube tone has resulted in Groove Tubes' reputation for consistency and premium quality. Want proof? Fender…