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Tubes for Unison's Simply Italy

Posted by fedocable (A) on March 8, 2018 at 08:41:53

Hello there. I own a Unison Research Simply Italy, which I adore. It uses two EL34 and two ECC82 (12au7) as rectifiers. So recently I decided to upgrade the 12au7's. After doing a lot of research, I went with the Psvanes. Right out of the box the sound was clearly more open and detailed than with the Tung Sols I'd used before, but it was also a bit too bright, too harsh on the trebles. The top end was always on front. Listening to a violin going allegro was almost unbearable. I gave them a long chance, thinking they might need some extended break-in, but that didn't help much. Considering the high praise those tubes have, I started researching a bit and found out that this amp might not be -as I had thought- auto-biasing -and it's definitely not manual-biasing either! So it might require tubes between certain parameters. I'm guessing this could be the reason why the Psvanes sound a bit over the top in it.
So my question to -hopefully- other owners of this amp: what brand of tubes have you tried? and which one do you like most?
Note there's no official thread for this amp, so any feedback will be highly appreciated!

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