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January 1st, 2008, 03:22 AM
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#1 (permalink) |
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Tele-Meister
Join Date: Feb 2006
Posts: 304
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5f4 clone rectifier questions
i have a 5f4 clone that shipped with a GZ34 instead of a 5U4G
i have heard the 5U4G will give more sag / compression which i see as a good thing is it worth swapping out the Gz34? this one has a biasing pot which AFAIK wasnt in the original design will it need rebiasing?
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January 1st, 2008, 11:12 AM
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#2 (permalink) |
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TDPRI Member
Join Date: Jan 2007
Location: Texas
Age: 57
Posts: 95
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Hello old_picker,
The 5U4 rectifier has more voltage drop than the GZ34, the voltage at the plates will go down. You'll need to check bias and adjust as necessary for proper tube dissipation. Also make sure your 5v windings on the PT can handle the additional load, the GZ34 uses 1.9 amps and the 5U4 uses 3.0 amps. Ken |
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