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
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