I have had this tube in my VTA-70 amp for about 3 months. It was recommended by the man that designed and built my VTA-70 amp, Bob Latino. I wasn't sure that changing the rectifier would make a noticeable difference, but it did. Hard to describe without getting into audiophile hyperbole, but to my ears, it sounds better. Smoother, I suppose. On a side note, I'm running Cornwalls that have had Bob Crites woofers and crossovers installed if that matters.