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Vacuum tube THD measurements?

Nobunaga

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Mar 19, 2019
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Hey

While doing some digging i came across this test here, measurements of the THD of some renowned tubes http://www.shine7.com/audio/6922_pre2.htm

The Siemens with the silver shield had the lowest THD, can that be taken at face value? meaning that every Siemens tube of that specific model has a lower THD than every other individual tube of the other models?

Or could the difference be within the marging of error of manufacturing tolerances/precision, age and how much life span the tube has left and test/measurement results (filament voltage, grid voltage, cathode voltage)?


Cheers
 

SIY

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The Siemens with the silver shield had the lowest THD, can that be taken at face value? meaning that every Siemens tube of that specific model has a lower THD than every other individual tube of the other models?

No. And of course, the circuit used is even more important than the tube type.
 
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