TUBE CODES

Hi,
I have some GeAt7 tubes,they are marked 58-39,58-17,4-39 and 5-22,does anyone know what these numbers mean?

yogiboy04-30-2010 8:08pm

yogiboy OP Details Discussions Posts This discussion Message User 5,510 posts 05-01-2010 at 09:15am Copy Comment URL Report Comment Edit Delete Thanks for the information.