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Old 22nd March 2012, 10:52 PM   #1
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Default general power tube output impedance chart?

ran across this while doing some googling. anyone know of any others. straight forward charts would be better than math formulas.
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Old 23rd March 2012, 12:17 AM   #2
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i think that those impedances should have B+ voltages associated with them, otherwise they don't tell a whole lot imho....
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Old 23rd March 2012, 12:22 AM   #3
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i think that those impedances should have B+ voltages associated with them, otherwise they don't tell a whole lot imho....

sounds like a good idea...so does such a chart exist? I posted a Groove tube chart with different bias voltages for different type tubes in another thread. So sure, a plate voltage chart should be floating around somewhere.
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Old 23rd March 2012, 12:31 AM   #4
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Those aren't tube output impedances, they're the plate-to-plate impedances of the output transformer for some specific amps.
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Old 23rd March 2012, 12:46 AM   #5
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it says on the charts, primary impedances, so i assume they are plate to plate impedances, what caught my eye, 2 x kt66 8000 ohms, must be either lower powered or high B+....
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Old 23rd March 2012, 12:51 AM   #6
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it says on the charts, primary impedances, so i assume they are plate to plate impedances, what caught my eye, 2 x kt66 8000 ohms, must be either lower powered or high B+....
Is that across the whole PP primary though, or from each leg to the centre tap?
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Old 23rd March 2012, 12:52 AM   #7
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It's plate-to-plate for the push-pull amps.
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