These are a great tube in every way, but a bit bass heavy for me. I find them a bit rough at mid gain/crunch, but role off to a great high gain tone. Cleans are musical and very low noise. Very nice in a Vox Night Train 50 watt guitar amp. The heavy bass can be good or bad. I'd recommend a good solid cab to handle the bass these put out. Not for a boomy cab unless you plan to re-enforce it to tighten it up. My friends like them for their 7 string guitars. Not really for me. I prefer a tighter less pronounced bass tone.