Mullard KQDD/K CV4004 ECC83 M8137 Box Plate Valve NOS 641 R5A1 (V4) #4

Mullard KQDD/K CV4004 ECC83 M8137 Box Plate Valve NOS 641 R5A1 (V4) #4
Mullard KQDD/K CV4004 ECC83 M8137 Box Plate Valve NOS 641 R5A1 (V4) #4

Mullard KQDD/K CV4004 ECC83 M8137 Box Plate Valve NOS 641 R5A1 (V4) #4
CV4004 M8137 ECC83 12AX7 Valve Tube. Grey Box Plates & Halo Getter. 641 R5A1 Code in the Glass. Fully Tested on AVO VCM 163. Ia 1.3/1.3 - Gm 1.6/1.6. 100% Book Spec = Ia 1.2 - Gm 1.6. New Old Stock, Supplied in Mullard Box.
Mullard KQDD/K CV4004 ECC83 M8137 Box Plate Valve NOS 641 R5A1 (V4) #4