"Groove Tubes was started in the late 1970s by Aspen Pittman, who had a lifelong fascination with tubes and tube tone. This fascination led to Aspen and a team of technical experts to re-evaluate the way tubes were tested and matched. Now, Groove Tubes are the most-used tubes in guitar amps and a favorite of tone aficionados. "
what type of music you play, I'm a blues/rock guitarist - some jazz fusion too.