I have for sale a Sylvania 5751WA 3 mica black plate tube with D getter. this is one of the best and most sought after 5751/12ax7 tubes. Check Joe's Tube Lore online. I do not know how it tests. It works fine except there is a slight background hum in my MG Head OTL tube headphone amp but it is not a problem when listening at normal levels. It worked fine in my headphone amp and sounds great (rich, warm sound). Yours for $25 shipped. This is your chance to try this legendary tube.
I can email pictures.
