Mullard KB/D CV4004 ECC83 M8137 Box Plate Valve NOS Boxed 641 R9B3 (V2)

CV4004 M8137 ECC83 12AX7 Valve Tube. Grey Box Plates & Halo Getter. 641 R9B3 Code in the Glass. Fully Tested on AVO VCM 163. Ia 1.2/1.05 - Gm 1.4/1.3.

100% Book Spec = Ia 1.2 - Gm 1.6. NOS, Supplied in Mullard Box.