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Old 17th August 2006, 12:32 PM   #1
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Default 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?

Thanks
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Old 17th August 2006, 02:14 PM   #2
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Triode connected?
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Old 18th August 2006, 12:43 AM   #3
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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.
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Old 18th August 2006, 02:10 AM   #4
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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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