Mullard KB/D CV4004 ECC83 M8137 Box Plate Valve Goalpost Support Getter NOS (V4)

CV4004 M8137 ECC83 12AX7 Valve Tube. Grey Box Plates & Goalpost Support Halo Getter. Fully Tested on AVO VCM 163. Ia 1.6/1.7 - Gm 1.6/1.7. 100% Book Spec = Ia 1.2 - Gm 1.6.

New Old Stock, Supplied in Mullard Box.