Mullard 12AU7 ECC82 Long Plate Goal Post Square Getter Blackburn 1957 K61 -NOS
K61 B7D (K61 = ECC82 production #1, B = Blackburn, 7 = 1957, D = April). Like a warm British jacket of the finest tweed, these glorious tubes have an attractive sweet warmth in their midrange and lower regions.