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diyAudio Member

Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
 Is there another appropriate method of measuring DF without having to unload the output transformer?
Yes, you can measure the output voltage with any two different load resistors and use a formula. I am 1200 miles away from my lab so I don't have the formula handy now. I use two identical 8 ohm resistors so I can get 4, 8 and 16 ohms. Scope or measure the output to verify that the amp doesn't go into clipping ,or the numbers won't be accurate.
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diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Blog Entries: 8
Quote:
 Originally Posted by tubelab.com Yes, you can measure the output voltage with any two different load resistors and use a formula. I am 1200 miles away from my lab so I don't have the formula handy now. I use two identical 8 ohm resistors so I can get 4, 8 and 16 ohms. Scope or measure the output to verify that the amp doesn't go into clipping ,or the numbers won't be accurate.
I don't have the equation on the top of my head either, but you can do as follows.
You measure the Vout with two different values of load, and calculate the output current for the two situations. Then you take the difference between the two load currents as delta-I, and the difference between the two Vout's as delta-V. Rout = delta-V/delta-I.

jan didden
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 3rd October 2011, 02:13 PM #13 diyAudio Member     Join Date: Jan 2008 Location: So.Cal. Thanks guys! I was assuming that two different loads would work; same as above except both R values are finite....... OK next question......if using 2, 4, 8, 16 ohm loads, connect them all to the 8 ohm tap? (I have 4 and 8 ohm taps available). Last edited by boywonder; 3rd October 2011 at 02:36 PM.

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