Vintage Sylvania chrome top, black plate 6SN7GTB, tests excellent on my Triplett 3444 at 2500/2600 Gm versus a minimum of 1700 Gm for this tester. Labeling is very good, everything is legible. Tube base and envelope in good shape, no burn marks, tight base, no cracks or broken octal guide pin. I get lots of compliments on tube quality, accurate description, good packaging and fast shipment, see my feedback if interested. Good luck bidding on this wonderfull vintage tube!