They mostly date from 1966/1967. These are designated as ECC83. They are not supplied with original boxes (I doubt they ever have had original boxes).
*Rare* Mullard Matched pair ECC83/12AX7 F92 1959 Valves/Vacuum Tubes -AVO Tested
*Rare* Mullard Matched pair ECC83/12AX7 mC6 1958 Valves/Vacuum Tubes -AVO Tested
12AT7WA ECC81 PHILIPS MULLARD NOS MATCHED PAIR VALVE TUBE
6P15Pev EL84 Vacuum tubes NOS USSR BOXED Matched PAIR Fully Tested UK Seller!
M8100 6AK5 CV4102 MULLARD SPECIAL GOLD PIN MATCHED PAIR VALVE/TUBE
Matched Pair Brimar Foreign GZ32 CV593 Rectifier Valves NOS
