Mullard, British Made

CV4004 M8137 12AX7 ECC83 Valve Tube

Grey Box Plates, Halo Getter

641 R7A3 Code in the Glass

Tested Good on Avo VCM 163

Ia 1.1/1.05 - Gm 1.6/1.5

100% Book Spec = Ia 1.2 - Gm 1.6

Used, Supplied in White Box