I have a Bogner Shiva head with 6L6 power tubes. I love this amp, it has great cleans, alot of bottom end and is really warm sounding. The distorted channel is really smooth, but a little buzzy sounding with the gain up over 60%. I tend to turn down the gain to about 40-50% and use a booster pedal to boost the mids. I can get a good Marshall type distortion that way. This amp is really good at letting your guitar's natural tone come through.