Psvane CV181-T in Dehavilland Ultraverve?

Black Treasures cv181s which I believe are reasonably close to the Psvane suggest 300 hours, however, as noted by Rgs92 I noted an immediate improvement over some NOS 6sn7s I was using in my Modwright Ls100 preamp. For what it is worth, the Black Treasure KT88s were a step up over Gold Lion Reissues in my Ayon Spirit 2 integrated.

I just received a pair of the top grade Psvane CV 181T's in the nice pink box from Grant Fidelity. I've been letting them play music now for about 50 hours (I know not the 200+ hours suggested). I'm comparing them to my beloved and well broken in Sylvania 6SN7 WGTA's 1977 vintage.

Right out of the box the 'vanes sounded down right crappy. But after 50 hours, what shines most is their really open and transparent midrange, precise focused images, tight bass, and even frequency response. I can hear waaay back into the recordings with these tubes. They are not as full and round sounding as the Sylvanias and lack warmth in the lower mids and upper bass as compared to the Sylvanias.

The Sylvanias have mids that are warmer, richer, rounder, but not quite as focused and not quite as resolving. Bass is just as deep, but a bit more flabby. Highs are just a bit more rolled off. The Sylvanias sound soooo smooth and warm and more delicate in the all important midrange, something that the Psvanes haven't yet matched.

I'll keep letting them burn in, but I think I've got a pretty good handle on how they sound compared to the Sylvanias.

Kward55,
Any update on Psvane vs Sylvania? How many hours you have on Psvane and are you noticing any more change in the sound? Which one are you preferring? I am using vintage sylvania in oppo 95.

I got a quad of these and I'm done tube rolling,
After trying most of the well reviewed NOS tubes there is nothing close to the Pavane CV 181/T II tubes, straight out of the box they blew me away,
After 200 hours my system has never sounded so good in every way, detail, bass extension, transparency.
I'll miss tube rolling I guess, but now I just listen and enjoy the music

I haven't used this amp, but I've never been disappointed with a Psvane/Black Treasure tube, CV181-T included.