Note: all of the Groove Tubes tubes and sets we carry are "Mediums," or in the 4 to 7 range. 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 tube amps now include Groove Tubes as standard equipment, and true tube aficionados worldwide swear by the tubes and pro audio products Groove Tubes makes.
These are fine sounding tubes and with the rating, you can replace the tubes in your amp with tubes that match your current pair rating of low, med or high WITHOUT re-biasing your amp! I have my DRRI biased pretty hot and it gets a richer, clean, warm sound because of it. When the tubes get tired I just order these and slap 'em in. I'm a good guitar player but I have no repair or maintenance skills so - anybody can do it..