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(!!!!) (Best Single 1962) ECC81=12AT7 Mullard BVA UK NOS copper grid posts 1962 (11.2/12.6ma)
(!!!!) (Recommended Mullard) E88CC=6922 Philips SQ England NOS 1971 (10.5/12.4ma) (Sweet, beautiful midrange, low noise)
(!!!) (Good Value) 6021=CV3986 Mullard UK Mitcham plant NOS 1971 (4.2/4.4ma and 4.2/4.4ma)
(!!!) (Single) 12AU7=ECC82 Mullard BVA UK ribbed plates used/good 1970 Mitcham plant (8.4/8.2ma) (sweet sound)
(!!) (Recommended Single) 12AT7=ECC81 Mullard shield logo NOS 1970 (8.0/8.4ma)
