CV4109 mullard tubes

I was told the Mullard CV4109 are the premium grade of E188CC/7308 tubes. Does anyone have any knowledge about these CV4109 tubes by Mullard?

jagdynamics04-19-2009 8:30pm

mofimadness Details Discussions Posts This discussion Message User 4,933 posts 04-19-2009 at 09:37pm Copy Comment URL Report Comment Edit Delete Here's the info I found: Mullard CV4109 - 1966 Premium Grade Long Life E188CC CV4108 7308 Halo Getter Military Stock Mullard Mitcham Production - Gt. Britain