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7687 Sylvania NOS 1962

7687 Sylvania NOS 1962

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0 tube) 7687 Sylvania NOS 1962

7.7ma Gm=2600 (triode) 100%

4.9ma Gm=4200 (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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