I picked up a grab bag of old EL34 tubes from CL this weekend. A couple of them are marked "Realistic". From what I know, they just re-branded tubes from other manufacturers. These say Made in Germany. Anyone have an idea of who might have really made them? There are also a couple of Sylvania's. Those say GT BRITAIN on them, but I'm pretty sure I've read that means they were really made in Japan. Any thoughts on those would be appreciated too. I don't have a tester, so I don't know if the EL34's are good yet, but I"ve installed the three RCA 12AX7's which were included and those seem to be fine. I'm hopeful that the EL34's are as well.