belles 21a preamp


anyone have any experience with the belles 21a tube preamp, with or without the auracap upgrade?

this is my second time posting, the first did not appear, this was a couple of days ago.
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I had the non-auricap version on loan. Rolled many tubes to try and achieve a sound that I liked. Main gripe was the decay of notes was brutally cut off. Perhaps auricaps may help, but my experience tells me the transitor output stage is the culprit.
anyone else have a problem with the decay of notes with the belles? what about tonality, speed,bass?