Depends on the amp
Bought these to try in my Traynor YBA-1 MOD-1 just for fun. Overall very good, quiet hi-fi like sounding tube. However I think they would be better in an amp that naturally has strong mids. The YBA-1 MOD-1 comes with EL34 stock and it's a great sounding amp that's more Fender Bassman like despite the EL34's. These tubes sound great but took a lot of the important mids away from the amp and really enhanced the lows and highs, which were very clear.