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What is the audio transformer?
https://www.ht-transformer.com/info/audio-transformer-51344509.html#:~:text=Audio%20Transformer%20uses%20this%20isolation%20property%20and%20creates,does%20not%20alter%20the%20voltage%20or%20current%20level.
Audio Transformer, its Types and Impedance Ratio
https://circuitdigest.com/tutorial/audio-transformer
Audio Transformer uses this isolation property and creates isolation between the output speakers or audio circuitry with the transformer’s input side amplifier system. In such case, 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
In a ribbon microphone, the ribbon element may have an impedance of well under 1 Ù, requiring a step-up transformer with a turns ratio of 1:12 or more to make its nominal output impedance around 150 Ù. Typical dynamic elements have impedances from 10 Ù to 30 Ù, which require step-up turns ratios from 1:2 to 1:4.
Output transformer ratio | diyAudio
https://www.diyaudio.com/community/threads/output-transformer-ratio.314011/
What is hidden in there is transformers have ratios, not impedances. They may be optimized for some impedance, but your 2.5k to 8 transformer only has the 2.5k when 8 ohms is on the other end. Put 4 ohms, 3.2 ohms or 16 ohms out there and the primary is different. They have no idea what impedance load will be used, so they provide the turns ratios.
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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