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-   -   general power tube output impedance chart? (http://www.diyaudio.com/forums/tubes-valves/209383-general-power-tube-output-impedance-chart.html)

speakerfritz 22nd March 2012 10:52 PM

general power tube output impedance chart?
 
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ran across this while doing some googling. anyone know of any others. straight forward charts would be better than math formulas.

AJT 23rd March 2012 12:17 AM

i think that those impedances should have B+ voltages associated with them, otherwise they don't tell a whole lot imho....

speakerfritz 23rd March 2012 12:22 AM

Quote:

Originally Posted by Tony (Post 2956769)
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.

SY 23rd March 2012 12:31 AM

Those aren't tube output impedances, they're the plate-to-plate impedances of the output transformer for some specific amps.

AJT 23rd March 2012 12:46 AM

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+....

Globulator 23rd March 2012 12:51 AM

Quote:

Originally Posted by Tony (Post 2956795)
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?

SY 23rd March 2012 12:52 AM

It's plate-to-plate for the push-pull amps.


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