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(!!!!) (Best Single) EF86 Mullard UK branded Philips Miniwatt "D" getter NOS 1954-1955 (3.3ma, Gm=2100) (oldest single)
(!!!!) (Single) EF86 Mullard UK branded Miniwatt "D" getter NOS 1959 (3.2ma, Gm=1800) (2nd oldest single)