Amperex 7643 E80CF 6BL8

The Amperex 7643/E80CF tube is a vintage NOS tube from the early '80s. Made in Great Britain at Philips Mitcham factory, they have gold pins and a dimpled disc getter. It is also known by the European designation E80CF or ECF80, and is a premium, long-life, ruggedized version of the 6BL8.

7643 Data Sheet

https://frank.pocnet.net/sheets/009/e/E80CF.pdf