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How to measure transformer ratio | recording hacks
http://recordinghacks.com/2017/08/29/how-to-measure-transformer-ratio/#:~:text=Assuming%20this%20is%20a%20typical%20audio%20transformer%20and,That%20simple%20calculation%20reveals%20the%20transformer%E2%80%99s%20turns%20ratio.
Audio Transformer, its Types and Impedance Ratio
https://circuitdigest.com/tutorial/audio-transformer
Audio Transformer creates isolation between the output speakers or audio circuitry with the transformer’s input side amplifier system. The primary and secondary winding turns ratio fixed to 1:1. Due to this, the transformer does not alter the voltage or current level.
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).
Audio Transformers - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/transformers04.php
As the turns ratio of the transformer is 10:1 the increase in apparent resistance (or impedance) is the square of the turns ratio. This relationship is described by the formula; Z P = Z S (N P /N S ) 2
Determining output transformer turn ratio and impedance ...
https://www.diyaudio.com/community/threads/determining-output-transformer-turn-ratio-and-impedance.280174/
Guys, Inject 6VAC into the output transformer Primary winding and I get the readings as follows: Primary winding = 5.8V. secondary winding = 0.25V. turn ratio = 5.8/0.25. = 23 : 1. impedance = 23X23. = 529 X 8 ohms.
Output Transformer Impedance
https://www.radioremembered.org/outimp.htm
Taking the square root of 875 gives us a 29.6:1 ratio, so an output transformer with a turns ratio in this range should work. By using the test procedure outlined above we can test our spare output transformers to see if we have one that will meet our approximate 30:1 …
Valve Amps: Output transformers - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_5.html
The amplified audio from the 2 output valves, push pull is in opposite phase 180deg. 300VAC + 300VAC = 600V AC is across the primary winding. Depending on the tranny design there may be 2,000 turns of wire in the Primary and 90 turns for the Secondary winding. 22:1 step down ratio. 600V AC / 22 = 27V AC into an 8&Omega speaker is 90 Watts.
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