ECC33 Mullard British Made batch code on glass black base 1960s top valves

Description

Mullard ECC33 valves with black base and square getter made in 1960s they suit all vintage and modern amplifiers where 6SN7GT is needed then the  ECC33 delivers the good the best it can!

Mullard ECC33 welded plate codes

5K2 nB7J1 made in Great Britain

5K2 B3A made in Great Britain (yellow print)

5K2 B1F British made

5K2 B5E British made

All tested 100% emission