12AT7 Holland branded CBS Hytron NOS large "D" getter halo 1954 (8.4/10.0ma)
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1 low noise tube) 12AT7 Holland branded CBS Hytron NOS large "D" getter halo welded to plate post (5436=1954), copper grid posts original CBS box
1 section) 8.4ma Gm=4300
1 section) 10.0ma Gm=5600
date code on bottom of tube (1950-1955) also date code on side of glass
See more: vacuum tube
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