Mullard KB/D ECC83 M8137 12AX7 Box Plate Dual Print Valve NOS 641 R5H2 (V54)

CV4004 ECC83 M8137 12AX7 Valve Tube. Grey Box Plates, Halo Getter.

641 R5H2 Code in the Glass. Fully Tested on AVO VCM 163.

Ia 1.6/1.55 - Gm 1.5/1.6.