6DR7 GE black plates NOS 1963 (1.5ma/57ma)
$ 8.99
1 tube) 6DR7 Philco by GE black plates NOS 1960's
1.5ma Gm=1500
57ma Gm=8100
Good Triode = 1.0-1.5ma Gm=1400-1600
Good Pentode = 25-35ma Gm=5500-6000
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