As far as reliability goes, I have used the Shuguang Black Treasures in a VAC Ren 30/30 which pushes the output tubes pretty hard and have had no problems. I really cannot estimate hours reliably, but definitely more than 600 hours and while starting to measure weak, they still auto-bias just fine and sound great.
Psvane 300-B Tubes ? ? ?
Does anyone out there have any experience with Psvane 300-B MKII or their WE300-B Replica tubes ?
I found the best sound from initially the Sophia Princess mesh-plate 300-B's, then their Royal Princess 300-B's however I'm definitely NOT happy with their reliability, especially the Royal Princess !
I had a mesh-plate from new have a glowing spot on the mesh-plate, and they told me it was from sitting on the shelf for over a year ! REALLY ! ? ! ? And I had two Royal Princess tubes go out with less than 600-hours on them, unfortunately well-past 1-yr. warranty. Left a bad taste... I'm NOT going back...
I've tried EH gold-grid 300-B's, Gold-Lion's, JJ's... All sound somewhat different but the Sophias sounded the best, however in my experience, reliability is questionable... Thanks... John
I found the best sound from initially the Sophia Princess mesh-plate 300-B's, then their Royal Princess 300-B's however I'm definitely NOT happy with their reliability, especially the Royal Princess !
I had a mesh-plate from new have a glowing spot on the mesh-plate, and they told me it was from sitting on the shelf for over a year ! REALLY ! ? ! ? And I had two Royal Princess tubes go out with less than 600-hours on them, unfortunately well-past 1-yr. warranty. Left a bad taste... I'm NOT going back...
I've tried EH gold-grid 300-B's, Gold-Lion's, JJ's... All sound somewhat different but the Sophias sounded the best, however in my experience, reliability is questionable... Thanks... John