CV4004, MULLARD, PINNACLE BADGED, BOX ANODE, ECC83, R6E3, MITCHAM MANUFACTURED, MAY 1966
CV4004, MULLARD, PINNACLE BADGED, BOX ANODE, ECC83, R6E3, MITCHAM MANUFACTURED, MAY 1966
As you can appreciate this represents good matching of each triode section within the envelope and a device showing superb emission.