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Nostalgia Air: Testing Transformers
http://www.nostalgiaair.org/references/articles/singles/xfrmr01.htm#:~:text=The%20type%20of%20test%20needed%20for%20the%20audio,ohms.%20High%20resistance%20%28megohms%29%20is%20a%20%22fail%22%20condition.
How to test an audio transformer | All About Circuits
https://forum.allaboutcircuits.com/threads/how-to-test-an-audio-transformer.168870/
If you have the ability you can apply an AC voltage to the primary and measure the AC voltage on the secondary side. A good place to start is get the turns ratio so apply a low AC voltage like maybe 3 volts to the primary and measure the secondary. If I apply 3 volts and get out 1 volt I have a 3:1 turns ratio.
How to test a small audio transformer to find out the ...
https://www.eevblog.com/forum/beginners/how-to-test-a-small-audio-transformer-to-find-out-the-specs/
Feed the signal from an audio signal generator into one side of the transformer and measure the output on the other winding using an oscilloscope or (if you have one) an audio millivoltmeter. I just tried this on a transformer pulled from a junk radio and got a …
Nostalgia Air: Testing Transformers
http://www.nostalgiaair.org/references/articles/singles/xfrmr01.htm
The type of test needed for the audio driver transformer is a simple ohmmeter "go/no-go" test. Check that each of the coils in the transformer is continuous. Generally, readings will be on the order of tens to hundreds of ohms. High resistance (megohms) is a "fail" condition.
Power Transformers for Audio Equipment | audioXpress
https://audioxpress.com/article/Power-Transformers-for-Audio-Equipment
Although C-core audio transformers for tube amplifiers have had fairly wide acceptance (at least in Europe and Japan), C-core power transformers are not common in audio equipment. Photo 8 shows a medium-power C-core power transformer, a single-loop transformer with windings on both legs of the core. R-Core Transformers.
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