Mullard KB/D M8137 CV4004 Box Plate Valve Tube NOS (V36)
CV4004 12AX7 ECC83 Valve Tube. Grey Box Plates & Halo Getter. 641 Code in the Glass. Ia 1.4/1.1 - Gm 1.6/1.8. 100% Book Spec = Ia 1.2 - Gm 1.6.
CV4004 12AX7 ECC83 Valve Tube. Grey Box Plates & Halo Getter. 641 Code in the Glass. Ia 1.4/1.1 - Gm 1.6/1.8. 100% Book Spec = Ia 1.2 - Gm 1.6.