6CA4 / EZ81 tubes

This 1958 Mullard EZ81 / 6CA4 rectifier tube was made in Great Britain and labeled for other companies. It has gray plates and a halo getter (8t1 series). The Blackburn, UK factory code is etched in the glass. Tube tests as new.

This 1962 RCA 6CA4 / EZ81 has gray plates and a halo getter. The red print on the glass has the RCA logo. Tube tests as new with balanced diode sections.

This 1960s Sylvania 6CA4 / EZ81 has gray plates and a halo getter. The label on the glass is partial/missing. Tube tests as new.