Vintage tube,Blackburn Mullard from mid 50s (early type)

Sguare getter,bottom code : K21 B4H

Tested on Roetest V10.1 with excellent results (26mA/23mA)

No shorts,no gas

box is not in best condition(see picture)

I will pack the tubes properly(in a wooden box), and will take great care in doing so

PRICE IS FOR 1 TUBE