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17th August 2006, 11:32 AM
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#1 |
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diyAudio Member
Join Date: Nov 2002
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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?
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17th August 2006, 11:43 PM
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#3 |
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diyAudio Member
Join Date: Nov 2002
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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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18th August 2006, 01:10 AM
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#4 |
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diyAudio Moderator
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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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