Mullard British Made Modern Logo M8137 CV4004 ECC83 Valve/Tube Grey Box Plates & Halo Getter Dual Printed M8137/CV4004 KB/D Factory Code in the Glass = 641 R2D2 Supplied in White Box Fully Tested on Avo VCM 163.. 100% Book Spec = Ia 1.2 - Gm 1.6 This Valve Tests = Ia 1.45/1.6 - Gm 1.6/1.7 1 Piece As Per Photo
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