GZ37 CV378 U54 Mullard Blackburn,triple mica,welded plate,pinched waist,matched

Description

GZ37 Mullard Blackburn (Great Britain),excellent condition
With two British NOS octal test sockets
Blackburn codes IS1,year 1960/61
Same construction,perfect matched pair
Brown base,pinched waist,welded plates,triple mica,bottom halo getter
Tested on Roetest V10.1
Tube results :
Tube 1 : 63mA/65mA
Tube 2 : 63mA/64mA
No shorts no gas
I will pack the tubes properly(in a wooden box), and will take great care in doing so
PRICE IS FOR TWO TUBES