I don't have the 300B tubes. But I recently got the Psvane 12AU7s. The initial 10-15 hours they sounded "alright". But once they "broke in", they are better than the Genalex Gold Loins I have. They are super transparent and open without sounding thin or shrill. I am thoroughly enjoying the music through these tubes.
Anyone try the Psvane Acme Supreme 300 B tubes ?
I recently replaced a couple pairs of Shuguang 845 Nature Series tubes with the Psvane Acme Supremes and right out of the box I was very impressed.My 300 B tubes have quite a few hours on them and I am considering replacing them with the new Psvane. If you have experience with these tubes I would love to hear about your impressions and possible comparisons to other 300 B tubes you have used.