Excellent sounding Gf8 12AU7A tubes labelled Sylvania. Manufactured at the Philips BEL plant in India on Mullard tooling. They have the 4 seams on top and many have the Mullard flash and share very similar sonics and are a great value. These are selected organ grade tubes. Tested on a calibrated Jackson 648A with no gas or shorts. All test over 100 and the sections are quite close, test results below are an example. Price is per pair. Many pairs available.