12SA7GT Nat. Union used/good 1950 era (2.8ma Gm=800)
$ 3.99
12SA7GT Nat. Union used/good 1950 era (2.8ma Gm=800)
dimple in glass
Gm NOS = 1000-1200
Good Ma used 2.5-3.1ma
See more: vacuum tube
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