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AUDIO TRANSFORMER DESIGN FOR TUBE AMPLIFIER WITH IMPR…
http://www.standardsuniversity.org/wp-content/uploads/audio_transformer_design_tube_amplifier_pichkalyov_final_paper.pdf#:~:text=The%20ratio%20of%20impedances%20produces%20the%20transformation%20ratio.,lamp.%20The%20audio%20speaker%20impedance%20is%204%20Ohm.
Chapter 5: Understanding Impedance In Audio Transformers
http://www.lundahl.se/wp-content/uploads/datasheets/PSW_WhitePaper_Download_Chapter_5.pdf
Transformers Rule (The Laws Of Physics, That Is...) As mentioned above, all audio input and output circuits, all loudspeakers, all microphones, and all transformers use impedance as a measurement of electrical value. This is because they are AC devices, not simple DC circuits.
Audio Transformer, its Types and Impedance Ratio
https://circuitdigest.com/tutorial/audio-transformer
Audio transformer power loss and optimal impedance matching
http://kearman.com/bentongue/xtalset/5hpXform/5hpXform.html
It's usually best to make the 1/2 voltage measurement at the frequency of minimum loss (usually about 1 kHz for audio transformers. In this series of Articles the statement is often made or implied that power loss in an audio transformer is at a minimum when the input is impedance matched. This is not strictly true.
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/08/Audio-Transformers-Chapter.pdf
1:2 turns ratio exhibited an impedance ratio of 1:4. Transformers always reflect impedances from one winding to another by the square of the their turns ratio or, expressed as a formula: Zp/Zs = (Np/Ns)2 where Zp is primary impedance, Zs is secondary impedance, and Np/Ns is turns ratio (which is the same as the voltage ratio).
How to measure transformer impedance? | All About Circuits
https://forum.allaboutcircuits.com/threads/how-to-measure-transformer-impedance.37161/
Measure the open circuit output voltage with sufficient drive to give you a small but easily measurable output voltage; call this voltage Vo. Now connect a resistor of suitable value; start with 10Ω. Measure the output voltage with the load resistor, RL, connected; call this voltage VL. The output impedance is given by Zo = RL*(Vo/VL - 1).
Audio Output Transformer Impedance Measurements …
https://www.youtube.com/watch?v=HV_6gmaZDF8
AUDIO TRANSFORMER DESIGN FOR TUBE AMPLIFIER WITH …
http://www.standardsuniversity.org/wp-content/uploads/audio_transformer_design_tube_amplifier_pichkalyov_final_paper.pdf
impedance of 4096 Ohm as this is the recommended impedance for the 6p1p tube lamp. The audio speaker impedance is 4 Ohm. By using the above formula, we can calculate the turn number of windings required. It is proportional to the ratio of input and output impedances: n=Np/Ns=(Zp/Zs)1/2
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