Mullard Blackburn ECC83 12AX7 Yellow Print Valve Tube NOS I63 B5E3 (V32)

Yellow Print Old Logo ECC83 12AX7 Valve Tube. Short Grey Plates, Halo Getter. I63 B5E5 Code in the Glass. Fully Tested on AVO VCM 163.. Ia 1.3/1.45 - Gm 1.8/1.9.

100% Book Spec = Ia 1.2 - Gm 1.6.