Mullard KB/D CV4004 ECC83 12AX7 Box Plate Valve Tube NOS 641 R5H4 (V50)

Box Plates & Halo Getter. 641 R5H4 Code in the Glass. Fully Tested Strong & Balanced on Avo VCM 163..

100% Book Spec = Ia 1.2 - Gm 1.6. Ia 1.4/1.4 Gm 1.5/1.5.