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"Explain Like I'm 5": Audio Transformers – DIY Recording ...
https://www.diyrecordingequipment.com/blogs/news/explain-like-im-5-transformers#:~:text=The%20most%20common%20core%20materials%20for%20audio%20transformers,more%20expensive%2C%20with%20less%20hysteresis%20than%20steel%20cores.
Audio Transformer - Engineers Garage
https://www.engineersgarage.com/audio-transformer/
The most commonly used audio transformer core materials are M6 steel (a steel alloy containing 6% silicon) and 49% nickel or 84% nickel (alloys containing 49% or 84% nickel plus iron and molybdenum). Nickel alloys are substantially more expensive than steel but being high permeability materials require lesser number of turns.
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/08/Audio-Transformers-Chapter.pdf
The permeability of some common “ferro-magnetic” materials is about 300 for ordinary steel, about 5,000 for 4% silicon transformer steel, and up to about 100,000 for some nickel-iron-molybdenum alloys. Because such materials concentrate magnetic flux, they greatly increase the inductance of a coil.
Audio transformers
https://www.aeetransformers.com/products/audio-transformer.html
Output transformers are available in the following materials: EI core; C core ; Amorphous core . Option: Output transformers with silver wound on the secondary side in combination with amorphous core. Power transformer: EI core; C core . Choke coils available in the following materials: EI core; C core ; Amorphous core; Versions: Open version, mounted on brackets
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