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Do It Yourself (DIY) paradise for tube and SET project builders.

Corrosion ......

The problem with a 7B4 DT is corrosion on the pins, it takes about 15 examples for Dennis to find one that is non-corroded and acceptable to him. This is not typical with a 12AX7.

Dennis regularly taps on the 7B4 while held to his ear, and listens to it before ever using it in a circuit. Amazing, to me, to see him do that at RMAF shows.


Jeff Medwin


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  • Corrosion ...... - drlowmu 06:32:01 08/25/14 (0)

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