Very rare tube Mullard Blackburn ECC83 /12AX7

Early Mullard ECC83 type Great Britain

17mm long plate,goalpost square getter,copper rods

Code : mC1 B7C (year 1957)

Very good condition

Tested on Roetest V 10.1(see last picture for results) and RM1 tube testers made in Germany

RM1 tube tester  (1.2mA = 100%)

Tube : 1.02mA /  1.2mA

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 ONE TUBE