Sounds like these tubes are preferred in the pro audio setting, to be utilized in a guitar amp! There the ability to fall into distortion quicker would be a value. The exact opposite of what we want in the audio world.
As a guitar player, that's the kind of tube I would search out for my amp, something that can add some distortion and tone without me having to push it too hard. May explain the OP's findings in his system!
As a guitar player, that's the kind of tube I would search out for my amp, something that can add some distortion and tone without me having to push it too hard. May explain the OP's findings in his system!