The Tung-Sols are not the same as far as I know. The TS are made in Russia while the Shuguang are Chinese. I'm using the Shuguang currently and have been happy with them in the past. I'd like to try the Tung-Sols but I've heard they won't stand up to the plate voltage of my Bogner Ecstasy (540vdc)
Korovamilkdud: Sorry to say the Mullards I had in my Splawn Quickrod were indeed very short lived. They gave up after six months of band practice, with no gigs. The amp sounded horrible so I checked the bias and one of the tubes showed no voltage. Buy a set of bias probes and a good meter, you'll be surprised how easy it is to bias an amp! I can help you thru the process if you need it. After the Mullards I ran the Shuguang in my Quickrod and really liked the tone!
Another plus: The Shuguang EL34b's are very cheap, one of the cheapest you can buy. I've spent way more on the latest "tube of the moment" only to be disappointed by the hype!
Just my opinon!