6DR7 Raytheon black plates NOS around 1960 (1.2ma/40ma)
By Tube World
$ 8.99
1 tube) 6DR7 Raytheon black plates NOS around 1960
1.2ma Gm=1400
40ma Gm=6900
Good Triode = 1.0-1.5ma Gm=1400-1600
Good Pentode = 25-35ma Gm=5500-6000
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