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Burnedfingers 17th August 2006 11:32 AM

5693 as a phono preamp?
Just wondering if someone has had experience using a 5693/6SJ7 as a phono preamp. If so do you have any schematics to share?


SY 17th August 2006 01:14 PM

Triode connected?

Burnedfingers 17th August 2006 11:43 PM

Well, it only has an amplification factor of 19 when it is triode connected. I cannot find the amplification factor in pentode. Maybe its not a good choice after all.

SY 18th August 2006 01:10 AM

Pentodes in general aren't good phono stage tubes because of partition noise, the excess noise inherent in pentodes because of the statistical nature of electron flow when given a choice between screen and plate. In this service, you'd do better with a triode. The 5691 could be a good choice if you can live with the input capacitance (a few hundred pF).

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