Mullard 12AX7 ECC83 f92 Vintage 1959 B9A Long Plate Shield Logo Tube (tests NOS)

This Mullard tube is likely used but in good condition overall. It features a 1959 date code of "B9A" with long plates and a round getter on dual supports. Minimum Gm (70%) is 1.1 and NOS spec (100%) is 1.6.