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7687 Sylvania rebranded Dumont NOS 1965

7687 Sylvania rebranded Dumont NOS 1965

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0 tube) 7687 Sylvania rebranded Dumont NOS 1965

8.0ma Gm=2500 (triode) 100%

5.6ma Gm=3600 (pentode) 70-75%


 

Amplitrex Test Data

Triode Good: 7.5ma Gm=2400-2500

Pentode Good: 8ma Gm=5500

 

(low hum and microphonics, good substitute for 6GH8A in Dynaco ST-70, mu=18, Gm=5800)
(highly recommended as sub for 6GH8A or 6U8A)

- Scott 299A

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