Damping Factor - Page 2 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 3rd October 2011, 02:37 AM   #11
diyAudio Member
 
tubelab.com's Avatar
 
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.
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 3rd October 2011, 03:04 AM   #12
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally Posted by tubelab.com View Post
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
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 3rd October 2011, 03:13 PM   #13
diyAudio Member
 
boywonder's Avatar
 
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 03:36 PM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Damping Factor in Amplifier brianti Solid State 37 14th September 2004 01:16 PM
Aleph4 damping factor alanyeoh Pass Labs 1 17th August 2004 10:11 PM
Damping factor Cro maniac Chip Amps 29 8th May 2004 02:16 PM
Damping factor thylantyr Solid State 9 14th March 2003 07:37 AM
Damping factor..????? emarald Solid State 15 30th January 2003 03:41 PM


New To Site? Need Help?

All times are GMT. The time now is 03:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2