Electronics > Repair

Pics of 20Hz, 1KHz, 20KHz amplifier signal. Why is the signal shape different?

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olegau:
It seems to me that the waveform should not change from 20 to 20,000 hertz, but my Yamaha CA-700 amp shows distortion at 20 and 20,000 hertz.
Who knows, maybe this is normal?

__greg__:
just use sine test signal.

for square signal it is "normal" and will vary depending on settings for bass/treble knobs....

RoGeorge:
This forum is for writing in English only, please use a translator and post your questions in English.

olegau:
Yes, I believe the amp is in good working order. The sinus signal is fain.

A good site: https://sound-au.com/articles/squarewave.htm

Haenk:
Maybe filter caps?

Work through the service manual is your best option:

https://elektrotanya.com/yamaha_ca-500_ca-700_amplifier.pdf/download.html

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