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6DR7 Sylvania black plates NOS around 1970 (1.3ma/25ma)

6DR7 Sylvania black plates NOS around 1970 (1.3ma/25ma)

$ 8.99

1 tube) 6DR7 Sylvania black plates NOS around 1970

1.3ma Gm=1600

25ma Gm=5500

 

Good Triode = 1.0-1.5ma Gm=1400-1600

Good Pentode = 25-35ma Gm=5500-6000

 

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