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Transformers For Small Signal Audio - sound-au.com
https://sound-au.com/articles/audio-xfmrs.htm#:~:text=Although%20small%2C%20it%20tends%20to%20affect%20the%20high,appears%20is%20the%20direct%20result%20of%20leakage%20flux.
Audio Transformer - Engineers Garage
https://www.engineersgarage.com/audio-transformer/
Audio output transformers are used when load impedances are low, as in line drivers, while audio input transformers are used when load impedances are high, as in line receivers. Output transformers have very low leakage …
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/08/Audio-Transformers-Chapter.pdf
Audio transformers must utilize both high-permeability cores and the largest practical number of coil turns to create high primary inductance. Coil inductance increases as the square of the number of turns and in direct proportion to the permeability of the core and can be approximated using the formula: L = 3.2 N28 ì A / 10 R
inductance of power & audio output transformers
https://www.antiqueradios.com/forums/viewtopic.php?t=120515
Audio transformers will appear to have lots of inductance, but as Curt noted, that's only because there's no DC flowing. If your application doesn't require much DC, that's fine, but to make a filter choke you'll have to restack the laminations.
Valve Amps: Output transformers - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_5.html
The output transformer is the heart of a valve amplifier. The right pic shows a stereo Leak amplifier. The two output trannys are rotated 90deg to the power mains tranny to avoid picking up induced hum from the mains tranny external magnetic field. Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth.
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