Exactly my point.
I can't comment from first hand experience as I always go for vintage, but from what I hear it seems to be pot luck.
From conversations I've had/seen there is a very wide variation of opinions!!
I know a couple of people who have had strange experiences with the PSVane, premature failure and very unusual mechanical vibration for example. I also know of a couple of suppliers who discontinued stocking TJ Full Music due to failures but they may have hit a bad patch. From what I've gleaned in discussions the issues revolve around QC, quality of materials used (i.e. not using copper rods) and fabrication process (i.e. lack of or poor welding )
One of our main UK valve sellers undertook some tests on the EL34 in 2005 but haven't updated it recently unfortunately which might have given a more up to date view! http://www.watfordvalves.com/cgi-bin/documents/testreport_46.pdf. It includes use in both an audio and musical amplification context.
Is the PSVane EL34 quality and life issues resolved? Has an users had a good 3000+ hours out of them?
I keep finding stories that they, plus the Mullard and JJ re-issue tubes are failing in 3 months.
I have read a few guys who rate the Shuguang EL34-B and Shuguang Treasures EL34. Shuguang,
which is a company mirroring TJ Full Music (both) in China which I really like.
Edited by complin - 4/27/14 at 4:56am