Mullard KB/D CV4004 ECC83 Box Plate Valve Tube NOS 641 R6D4 (V16)

ECC83 CV4004 12AX7 Valve Tube. Grey Box Plates, Halo Getter.

641 R6D4 Code in the Glass. Fully Tested on AVO VCM 163.. 100% Book Spec = Ia 1.2 - Gm 1.6.

Ia 1.4/1.1 - Gm 1.4/1.2.