12AT7=M8162 Mullard copper grid posts NOS 1960's (8.0/10.4ma)
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1 low noise tube) 12AT7=M8162 Mullard copper grid posts NOS 1960's, date code is wiped off glass but construction of tube is from 1960-1965 based on rough textured glass and internals
1 section) 8.0ma Gm=4600
1 section) 10.4ma Gm=5700
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