(Manufacturer Mullard. Mullard Code Gf2 B7E1/ B7F4. Pulled from a Hammond tube organ. T he Tube tested at 96% (1.160 x 83.1 = 96.396 %). 50= 65% of the value of a new tube. Tested Plate 1) 83.1 / 89.7 Plate 2) 88.0 / 89.7.
(Manufacturer Mullard. Mullard Code Gf2 B7E1/ B7F4. Pulled from a Hammond tube organ. T he Tube tested at 96% (1.160 x 83.1 = 96.396 %). 50= 65% of the value of a new tube. Tested Plate 1) 83.1 / 89.7 Plate 2) 88.0 / 89.7.