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

RE: Not enough gain on 76

You mentioned the 5687. A similar high gm/low RP type. with a μ of 22, is the ECC99. With CCS loading, you'd get the gain wanted.

FWIW, Lynn Olsen has used the ECC99 in his 300B designs.


Eli D.


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