Actually the common wisdom is that triodes are more 'beautiful' and truthful than pentodes (or anything else), and directly-heated triodes doubly so. I'm not saying there's anything wrong with EL34s (especially strapped triode) but you aren't going to lose "beauty" with a good DHT amp (of basically any sort).
It seems to me that the closer you get to an 'ideal' amp the more tubes sound similar, the more single-ended sounds like push-pull, tubes sound like transistors, having output tranformers sounds like OTL, and so forth. For example, a Viva Solista 845 SET amp would be hard to nail as an 845 SET since it doesn't sound fuzzy, rounded, or rolled-off like most of them (excluding top brands). At all. But it still does have a bit of DHT glow, which is why I suspect the designer uses DHTs.
It seems to me that the closer you get to an 'ideal' amp the more tubes sound similar, the more single-ended sounds like push-pull, tubes sound like transistors, having output tranformers sounds like OTL, and so forth. For example, a Viva Solista 845 SET amp would be hard to nail as an 845 SET since it doesn't sound fuzzy, rounded, or rolled-off like most of them (excluding top brands). At all. But it still does have a bit of DHT glow, which is why I suspect the designer uses DHTs.