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US5917396A - Wideband audio output transformer with …
https://patents.google.com/patent/US5917396A/en
An improved wideband audio output transformer having a common magnetic core with a plurality of continuous magnet wires forming a multifilar ribbon capable of …
US3573648A - High power audio ... - patents.google.com
https://patents.google.com/patent/US3573648A/en
A high-power audio amplifier employing both cathode and anode load unity coupled cofilarly wound transformer primary windings, providing negative feedback by means of a transformer winding which is...
Wide band audio transformer with multifilar winding ...
https://www.freepatentsonline.com/5500632.html
Wide band audio transformer with multifilar winding United States Patent 5500632 Abstract: An output transformer for use with a push-pull vacuum tube amplifier using a multifilar ribbon in which primary windings and secondary windings co-exist. The multifilar ribbon is wound continuously around a common core side-by-side to form successive layers.
Audio Transformer - Engineers Garage
https://www.engineersgarage.com/audio-transformer/
Line Output. Typically, audio transformer is driven by an amplifier and loaded by several thousand pF cable capacitance and high input impedance of line receiver. Therefore, a line output transformer should have low output impedance which remains low at high frequencies. This requires both low resistance windings and very low leakage inductance. 5.
AUDIO TRANSFORMER DESIGN FOR TUBE AMPLIFIER WITH …
http://www.standardsuniversity.org/wp-content/uploads/audio_transformer_design_tube_amplifier_pichkalyov_final_paper.pdf
OUTPUT AUDIO TRANSFORMER DESIGN The output transformer in a single-ended tube amplifier is the device which matches the high-output impedance of the tube to the low input impedance of the speaker load (4, 8 or 16 Ohm). To design an output transformer, it is necessary to determine the output power according to the tubess characteristics, most notably the input and output …
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/09/Audio-Transformers-Chapter.pdf
Conversely, a transformer with a turns ratio of 1:2 would be called a step- up transformer since its secondary voltage would be twice that of the primary. Since a transformer does not create power, the power output from the secondary of an ideal transformer can only equal (and in a real transformer only be less than) the power input to the primary.
Audio Transformers - Learn About Electronics
https://www.learnabout-electronics.org/ac_theory/transformers04.php
Audio Frequency (AF) Transformers work at frequencies between about 20Hz to 20kHz and are used in audio amplifier circuits, they were essential in valve (tube) designs for matching the high impedance outputs of theses amplifiers to low impedance loudspeakers, but transistor amplifiers have much less need for output transformers.
Transformer winding examples!!!! | diyAudio
https://www.diyaudio.com/community/threads/transformer-winding-examples.206746/
David Hafler, a founder of Dynaco and Acrosound, patented the output transformer coil-placement optimizations used by both of those companies and licensed to some others in patent 2,815,408. I'd suggest reading it.
Audio output transformer winding, electronics - YouTube
https://www.youtube.com/watch?v=aMIToWZOelo
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Valve Amps: Output transformers - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_5.html
Output trannys contribute most of the distortion in a valve amp and have a limited bandwidth. Valve amp manufacturers purchase trannys from transformer winding companies. Transformer winding is an extension of the fitting and turning industry. Few people working in transformer winding companies have a knowledge of electronics or valve amps.
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