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Transient Response – Barefaced Audio
https://barefacedaudio.com/pages/transient-response#:~:text=Inductance%20causes%20the%20current%20to%20lag%20the%20voltage,inductance%2C%20the%20more%20the%20transient%20response%20is%20delayed.
Analyze Low-Frequency Response of Amplifier - The ...
https://www.theengineeringknowledge.com/analyze-low-frequency-response-of-amplifier/
For capacitively coupled amplifier if signal frequency is less than critical value then there will be an effect on voltage gain and phase shift. At less value of frequency, the reactance of the coupling capacitor becomes sufficient which causes a decrement in voltage gain and increment in phase shift.
Poor amplifier frequency response. - diyAudio
https://www.diyaudio.com/community/threads/poor-amplifier-frequency-response.350337/
You can break the jumper and feed signal to the amp section to test the frequency response ok or not. I think we can input a RCA pre-amp output to the power amp section to test it in real listening. below maybe the power amp diagram and another is the 120 model with DC servo circuit for reference.
Amplifier Low-Frequency Response | Engineering360
https://www.globalspec.com/reference/9649/359749/amplifier-low-frequency-response
The low-frequency response of this amplifier is determined in part by these three capacitors (C , Co and C E) . The result is essentially a combination of three high-pass filter networks that allow signals having frequencies greater than the cutoff frequency of the dominant network to pass through while attenuating all others.
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