Hi folks, my Traynor YBA 300 amp needs some new tubes. Although I have this amp for only a year now, two of the 6 pairs behave quite strange... looking at the BIAS in the back, usually the indicators start glowing yellow (HIGH) when playing, but these two pairs simply do nothing most of the time, sometimes indicates LOW... So to go short, replacing!!! I sorted out all the tubes I can get over here in the Netherlands. I need 6L6 tubes (or EL34, but I want 6L6 again) and after hours of reading I figured out that TubeAmpDoctor tubes will do best regarding what you get for the price. But, of course, they have two different types of tubes, which are: - 6L6GC STR - 6L6WGC STR It seems that adding a "W" costs around 10 Euros, so here's the thing: They say the WGC last longer and are "heavy duty" - but are they worth the 10 euros more? Does anyone have experience with these tubes?