I'm gonna have to order some new power tubes for my TSL 100 watt head.It has Groove tube GTEL34-m in it now and one of them is bad.I can't afford a matched quad set of NOS:-(.I've been looking at another matched set of GTEL34-m,JJs and mullards.Does the same factory make all of these now and just relabel them?Also I've read that there are some fakes on e-bay is there any dealer I should avoid?Thanks in advance for any info and opinions