well please let us know how Rachel responds to your questions about quality control. I believe she sent a 32 page instruction manual to the boys in Hong Kong detailing how to test those tubes. Be careful of asking how she monitors compliance from Canada if she never actually touches the tubes that she sent to you.
I got my Psvane's via ebay, not from Grant Fidelity. However, looking at GF's more recent words on their post-production extra matching and testing, I think the extra $30 or so would be well worth it if I were to get any more Psvanes.
Anyway, the culprit of my Unexplained Noise can now be revealed: It was the Tube that did it. The noise did move with the tubes when I swapped them around. Talk about being caught in the act: I could actuallly see some sparks/arcs in one of the PH's - at which point I thought it might be quite a good idea if I switched off the amp.
The trouble is, having been spoilt by the PH sound, I'd hate to downgrade now, so it's either another set of PH's or the NOS route - and the latter has its own trials and tribulations, especially for a Tube Noob with no Tube Tester etc.
In the meantime, the stock JJs are going back in for a couple of days, so I can lessen my expectations in order to make my Treasures sound good again.
Phil95, I'm glad it wasn't the headhones themselves - that would have been much more effort to resolve.