(!!) EZ35=6X5GT Mullard UK used/tests like new 1950-1955 small crack in base (52/40 and 57/40)
EZ35=6X5GT Mullard UK NOS 1955 (51/40 and 51/40)
EZ35=6X5GT Mullard UK NOS 1959 (52/40 and 55/40)
EZ35=6X5GT Mullard UK NOS 1964 (50/40 and 52/40)