Hi
First with respect to buzzing, noise.... My ex wife used to use those plug in air fresheners. It took me a while to trace, especially after swapping known good tubes and getting the same result. It was a noise that mimicked a bad tube. It was on an entirely different circuit, go figure.
More recently, i had a buzzing in both speakers. Low level, but irritating. Turned out to be my Powerline 2000 ethernet over AC adapter I use for my Vault and BluRay... I switched to a Linksys AC1200 Max wireless bridge. Amazingly solved all noise issues. What was strange is my preamp had the buzz in all inputs, once I removed the ethernet cable, dead silence.
I am using JJ tubes in my Quicksilver Mid Monos and my c-j Classic 2SE and they sound great. I have used Gold Lion and they were great too but the JJ's tone in my system is superb... so good I'm afraid to touch it.
One thing I can say about the Gold Lion is that they are extremely rugged. Their 6922 is the only tube I've used in that c-j that lasted more than a year before going noisey. They sound great too. I've used their 12ax7 and same thing, great tube , long lasting.