This is a Sylvania 6F8G vacuum tube, an electron tube featuring a classic octal base design. The tube is clearly marked with the model number "6F8G" on its glass envelope, indicating its specific type and characteristics for radio communication and audio applications. The base of the tube proudly states "MADE IN U.S.A.", highlighting its origin. Additional markings on the base include "LICENSED PATENT NO. 1761099," "NO. 1773099," and "RE. 19747," which are patent identifiers related to its manufacturing.

This listing includes the single Sylvania 6F8G vacuum tube as pictured. It is a genuine component from a reputable manufacturer, suitable for vintage radio, amplifier, or other electronic equipment repair and restoration projects. The tube features a robust glass construction with a metal base and multiple pins for socket insertion, characteristic of vacuum tubes from its era.

Verified Specifications:
Brand: Sylvania
Item Type: Vacuum Tube
Model: 6F8G
Material: Glass, Metal
Base Type: Octal
Features: Made in USA, Licensed Patent Numbers
Included Components: 1x Sylvania 6F8G Vacuum Tube
Country of Origin: USA
Part Numbers: 1761099, 1773099, RE. 19747