Groove Tubes GT-E34LS Medium Duet (Pair) TubesThe Groove Tubes GT E34LS Medium Duet Tubes are the original power platform behind most high powered British guitar stacks from the 60s onward. Output is generally between 20 and 25 watts, with pronounced mid range punch, tight low end and crisp top end that breaks up relatively smoothly and gets a little crunchy when pushed hard. It provides a great voice that stands out in a band mix as the mids tend to power their way through an overall mix. Big