Excellent for V1
I cynically purchased a Preferred Tube 7025 for the V1 position for my Mesa Boogie Mark V. I sampled other tubes (Tungsol, Northern Electric, Mullard) in the same position with varying results. The result was highly positive. It enriched the bass and low mids very well, giving my guitar sound an attack for which I have been wishing. The high end is clear without being harsh. I well balanced tube. Not only am I curious about the sound if I replace the other stock tubes (I think they are Mesa branded JJ), but also placing them in my Mesa Rectifier PreAmp.